AN910 datasheet(36/51 Pages) STMICROELECTRONICS

36 / 51 page

36/51

ST7 AND ST9 PERFORMANCE BENCHMARKING

7.3.9 ST7 MCU core

On-chip/Off-chip buses

- on-chip buses

16-bit address bus

8-bit data/program memory bus

Memory Space

Von Neumann organization

- linear data/program memory space

64 kbytes

256-byte zero page

128-byte peripheral register space

direct addressable

upper 32-byte interrupt vector table = 14 interrupts

Arithmetic Logic Unit

8-bit datapath

- 8-bit operations

- special functions

8x8 unsigned multiplication

11 cycles

Instruction processing

Standard

- sequential processing

Cpu internal buses

16-bit address bus, 8-bit data bus

(to be confirmed)

Instruction set

Cisc encoding

- CPI

2 cycles to 12 cycles

- average CPI

between 4 and 5 cycles

- IL

1 byte to 4 bytes

- average IL

between 2 and 3 bytes

- special addressing modes

indirect (short/long)

Programming model

Accumulator

- one 8-bit accumulator

- two 8-bit index registers

- other registers

16-bit program counter

16-bit stack pointer

condition code register

+ x

ST7 CPU

(X),A

ADD A,#A0

AN910 数据表(PDF) 36 Page - STMicroelectronics

AN910 数据表(HTML) 36 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

数据表下载