AN910 datasheet(33/51 Pages) STMICROELECTRONICS

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ST7 AND ST9 PERFORMANCE BENCHMARKING

7.3.6 H8/300 MCU core

On-chip/Off-chip buses

- on-chip buses

16-bit address bus

8/16-bit data/program memory bus

- off-chip buses

8/16-bit address bus

8-bit data/program memory bus

the two buses are multiplexed with ports

Memory Space

Von Neumann organization

- linear data/program memory space

64 kbytes

upper 176-byte on-chip register field

additional 16-byte on-chip register field

first 48-byte interrupt vector table = 21 interrupts

Arithmetic Logic Unit

8-bit datapath

- 8/16-bit operations

- special functions

8x8 unsigned multiplication

14 cycles

16/8 unsigned division

14 cycles

Instruction processing

Standard

- sequential processing

Cpu internal buses

16-bit address bus, 16-bit data bus

8-bit register bus (to be confirmed)

Instruction set

Risc encoding

- CPI

2 cycles to 24 cycles

- average CPI

between 5 and 6 cycles

- IL

2 bytes or 4 bytes (even)

- average IL

between 2 and 3 bytes

- special addressing modes

with 16-bit offset

with pre/post-increment

- special instructions

block moves

Programming model

- general registers

sixteen 8-bit registers

useable as eight 16-bit registers

include one 16-bit stack pointer

- others registers

16-bit program counter

condition code register

MOVE Rd,Rs

ADD

Rd,#2

+ / x

H8/300 CPU

AN910 数据表(PDF) 33 Page - STMicroelectronics

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