参数资料
型号: MB89635RP-SH
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDIP64
封装: SHRINK, DIP-64
文件页数: 76/153页
文件大小: 7326K
代理商: MB89635RP-SH
MB89630 SERIES HARDWARE MANUAL
2-6
2.1.3 Internal Registers in CPU
The MB89630 series of microcontrollers have dedicated registers in the CPU, and general-purpose regis-
ters in memory.
<Dedicated registers>
Program counter (PC) ........... 16-bit long register indicating location where instructions stored
Accumulator (A) .................... 16-bit long register where results of operations stored temporarily; the
lower byte is used to execute 8-bit data processing instructions.
Temporary accumulator (T) ... 16-bit long register; the operations are performed between this register and
the accumulator. The lower one byte is used to execute 8-bit data process-
ing instructions
Stack pointer (SP) ................. 16-bit long register indicating stack area
Processor status (PS) ........... 16-bit long register where register pointers and condition codes stored
Index register (IX).................. 16-bit long register for index modification
Extra pointer (EP).................. 16-bit long register for memory addressing
The 16 bits of the program status (PS) can be divided into 8 upper bits for a register bank pointer (RP) and
8 lower bits for a condition code register (CCR). (See Figure 2.4.)
Fig. 2.4 Structure of Program Status
Program counter
Accumulator
Temporary accumulator
Index register
extra pointer
Stack pointer
Program status
FFFDH
Undefined
I flag = 0, IL1, 0 = 1.1
All others than the above
are undefined.
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