AN910 datasheet(38/51 Pages) STMICROELECTRONICS

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ST7 AND ST9 PERFORMANCE BENCHMARKING

7.3.11 KS88 MCU core

On-chip/Off-chip buses

- on-chip buses

8/16-bit address bus

8-bit program memory bus

8-bit register bus

- off-chip buses

8/16-bit address bus

8-bit data/program memory bus

the two buses are multiplexed

the two buses are multiplexed with ports

Memory Spaces

Von Neumann organization

- register file space

192-byte prime data register space (all addr. modes)

64-byte register set 1

16-byte working register space (working reg. addr.)

16-byte system register space (register addressing)

32-byte system & peripheral control register space

(register addressing)

64-byte register set 2

64-byte data register space (indirect, indexed, stack)

- linear data/program memory space

64 kbytes

first 16-Kbyte program memory only

first 256-byte interrupt vector table = 128 interrupts

Arithmetic Logic Unit

8-bit datapath

- 8-bit operations

- special functions

8x8 unsigned multiplication

24 cycles

16/8 unsigned division

28 cycles

Instruction processing

Standard

- sequential processing

Core internal buses

16-bit address bus, 8-bit data bus

8-bit register bus (to be confirmed)

Instruction set

Cisc encoding

- CPI

6 cycles to 28 cycles

- average CPI

between 10 and 12 cycles

- IL

1 byte to 3 bytes

- average IL

between 2 and 3 bytes

- special addressing modes

indirect address/register

indexed (short/long)

- special instructions

compare & increment & branch like

decrement & branch like

Programming model

- prime registers

192 8-bit prime data registers

- two register sets

sixteen 8-bit working registers

sixteen 8-bit system registers

32 8-bit system & peripheral control registers

64 registers

- other registers

16-bit program counter

system and user stack pointers

- multitasking capabilities

context switching with register sets

system and user modes

+ / x

KS88 CPU

MOVE Rd,Rs

ADD

Rd,#2

AN910 数据表(PDF) 38 Page - STMicroelectronics

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