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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁

  • NEC   NEC

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CHAPTER 3
PROGRAM COUNTER (PC)
3.2.4 Program Counter during Execution of Return Instructions (RET, RETSK, RETI)
During execution of a return instruction (RET, RETSK, RETI), the program counter is restored to the value saved
in the address stack register.
Figure 3-8. Value in the Program Counter during Execution of a Return Instruction
Address stack register n
MSB
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
(n = 0 to 4)
LSB
PC0
3.2.5 Program Counter during Table Reference (MOVT)
During execution of table reference (MOVT DBF, @AR), the value in the program counter is saved in the stack,
the address register is set by the program counter, then the contents stored at that program memory location is read
into the data buffer (DBF). After the program memory contents are read into DBF, the program counter is restored
to the value saved in the address stack register.
Caution One level of the address stack is temporarily used during execution of table reference. Be careful
of the stack level.
3.2.6 Program Counter during Execution of Skip Instructions (SKE, SKGE, SKLT, SKNE, SKT SKF)
When skip conditions are met and a skip instruction (SKE, SKGE, SKLT, SKNE, SKT, SKF) is executed, the
instruction immediately following the skip instruction is treated as a no operation instruction (NOP). Therefore,
whether skip conditions are met or not, the number of instructions executed and instruction execution time remain
the same.
3.2.7 Program Counter When an Interrupt Is Received
When an interrupt is received, the value in the program counter is saved in the address stack. Next, the vector
address for the interrupt received is placed in the program counter.
3.3 CAUTIONS ON PROGRAM COUNTER OPERATION
Consisting of 10 bits, the
碌
PD17120/17121's program counter (PC) can specify a program of up to 1024 steps.
As opposed to this, the ROM size is only 768 steps (addresses 0000H-02FFH). If the program counter's value exceeds
300H, the contents of the program are equivalent to reading FFFFH and executing the "SKF PSW, #0FH" instruction.
Therefore, be careful about the following point:
(1) When the instruction at the 768th step (address 02FFH) is executed, it does not automatically happen that
the program counter goes to 0000H. If the instruction up to the 768th step (address 02FFH) is other than
a branch (BR) or (RET) instruction, it will result in specifying a program counter not contained in a ROM. Be
careful about this.
(2) In the same manner as (1), please avoid using an instruction that will branch to after the 768th step (address
02FFH).
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