JPH03228190A - Microcomputer - Google Patents

Abstract

PURPOSE:To easily obtain a microcomputer optimized to an application system more than ever by enabling the logical configuration of the application peripheral of the microcomputer to be changed. CONSTITUTION:A CPU 102 loads data for the setting of the logical configuration of a programmable application peripheral (PAP) 105 on a memory 106 for logic setting by executing software stored in a program memory 101. Loaded logic configuration data functions as the application peripheral of prescribed function developed at a prescribed logic circuit at the PAP 105. In such a case, since the PAP 105 is comprised of the cell of a gate array and a programmable LSI, etc., a fundamental function can be remarkably changed by logic comprising data. In such a way, high suitability can be obtained by the application system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microcomputer, and in particular, a microcomputer in which a CPU, program memory, data memory, application peripherals, etc. are formed on a single semiconductor substrate.

[Conventional technology]

Conventionally, in this type of microcomputer, in order to easily adapt the functions of application peripherals composed of gate arrays, etc. to the application system, a load setting register, etc. is provided in the circuit of the application peripheral, and data is stored in this mode setting register. The data used was used to realize functions such as conversion.

[Problem to be solved by the invention]

The conventional microcomputers mentioned above are limited to simple conversion of the functions of application peripherals using data stored in the mode setting register, such as changing functions from 8-bit to 16-bit, but do not allow major changes in the main functions. I couldn't.

An object of the present invention is to provide a microcomputer in which the functions of application peripherals can be significantly changed.

[Means to solve the problem]

The microcomputer of the present invention is characterized by having a programmable application peripheral whose logic circuit configuration is determined in response to state setting data, and a logic setting memory that stores the state setting data.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram for explaining a first embodiment of the present invention. Microcomputer 1°8 is CPU10
2,7ogram memory 1o1. Logic fixed application peripheral, hereinafter referred to as SAP>103. Data memory 107. Programmable application peripheral (hereinafter referred to as PAP) 105 and logic setting memory (
(hereinafter referred to as LMEM) 106, and an external peripheral circuit 1
Interface with 04. Microcomputer 1
In 08, program memory (hereinafter referred to as P-MEM)
By executing the software stored in 101, CPU 1
02 controls the state of SAP 103 and PAP
Data for setting the logical configuration of 105 is stored in L-MEM.
106. The necessary types of data to be loaded are arranged and prepared before the software is executed and used selectively when the software is executed, or the data to be loaded itself is rewritten as the software is executed.

The logical configuration data loaded into the L-MEM 106 is P
It is developed into a predetermined logic circuit in the AP 105 and functions as an application peripheral with a predetermined function. here,
Since the PAP 105 is composed of gate array cells, 5, programmable LSI, etc., its basic functions can be significantly changed by using logic configuration data. Naturally, this also includes simple configuration conversions such as switching logical configurations.

Here, the operation when the PAP 105 is configured as a shift register or a timer according to the logical configuration data of the MEM 106 is shown in Figures 2 and 3 (a).
, (b).

First, PAP105 is
A basic configuration is formed in which the basic function of the shift register is to function as a timer. Next, by executing the software stored in P,MEMlol, PAP 105 initializes its logic circuit configuration to an 8-bit shift register. In the next step, the software will be updated to SAP 10
3 etc. from the external peripheral circuit 104 connected to the PAP 10
Receive the functional conditions to be set in 5 as data, and
It is determined whether P105 should be set as a shift register. If the condition is YES, the software is PAP
The process proceeds to the processing of external input data input to the PAP 105 without changing the settings of the PAP 105. On the other hand, if the condition is No, the software resets the logic circuit configuration of the PAP 105 to a timer and proceeds to process external input data input to the PAP 105.

PAP 105 in FIG. 1 corresponds to 311 and 321 shown in FIGS. 3(a) and (b), but PAP
The function 105 is set as 311 shown in FIG. 3(a) during the period of Phase 2 in FIG. Each function is set as 321 shown in FIG.

FIG. 4 is a block diagram showing a second embodiment of the present invention. The difference from the first embodiment is that the logic setting memory L-MEM 40 is used to set the logic circuit configuration of the PAP 405.
Instead of the CPU 402 executing the data setting to 6,
In terms of setting from outside the microcomputer 408,
The other configurations are the same.

This embodiment uses a microcomputer 4 for applications where it is not necessary to change the functions of the PAP in various ways by executing software.
It is most suitable when using 08. Furthermore, in this embodiment, since data to the L-MEM 406 is set from outside the microcomputer 408, there is an advantage that the circuit configuration is simplified.

In the embodiments described above, shift registers and timers have been described as examples of logic circuits configured by programmable application peripherals, but the present invention is not limited to these logic circuits, and can be applied to decoders, encoders, etc. , similar effects can be obtained with other logic circuits.

〔Effect of the invention〕

As explained above, the present invention has the effect of making it possible to easily create a microcomputer that is more optimized for an application system by making it possible to significantly change the logical configuration of the application peripherals of a microcomputer. Furthermore, since application peripherals can be changed in real time while software is being executed, it goes without saying that the external terminal functions of the microcomputer can be multiplexed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention;
The figure is a flowchart for explaining the function setting state in the first embodiment, FIGS. 3A and 3B are block diagrams showing an example of the functions of the programmable application peripheral, and FIG. FIG. 2 is a block diagram showing a second embodiment. 102.402...CPU, 105,311,321
,．． 405...Programmable application peripheral, 106,406...Logic setting memory,
409...Data generation section.

Claims (1)

[Claims] 1. A programmable application peripheral whose logic circuit configuration is determined in response to state setting data;
A microcomputer comprising a logic setting memory that stores the state setting data. 2. The microcomputer according to claim 1, wherein data is supplied to the logic setting memory from the outside.