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| 型號： | V30MZ |
| 英文描述： | V30MZ(TM) Hardware (Preliminary) | User＇s Manual[01/2002] |
| 中文描述： | V30MZ（TM）硬件（初步）|用戶手冊[01/2002] |
| 文件頁數(shù)： | 26/89頁 |
| 文件大小： | 418K |
| 代理商： | V30MZ |
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CHAPTER 3 CPU FUNCTIONS
26
3.1.4 Program counter (PC)
The PC is a 16-bit binary counter that holds the offset information of the memory address of the program that the
execution unit (EXU) is about to execute.
The PC value is automatically incremented (+1) every time the microprogram fetches an instruction code from an
instruction queue.
Furthermore, in execution of a branch instruction with branch or condition, subroutine control instruction, and
interrupt instruction, a new location is loaded and the PC value becomes the same as that of the prefetch pointer
(PFP).
3.1.5 Program status word (PSW)
The PSW consists of 6 kinds of status flag and 4 kinds of control flag.
(1) Status flag
Overflow flag (V)
Sign flag (S)
Zero flag (Z)
Auxiliary carry flag (AC)
Parity flag (P)
Carry flag (CY)
(2) Control flag
Mode flag (MD)
Direction flag (DIR)
Interrupt enable flag (IE)
Break flag (BRK)
The status flag is automatically set (1) and cleared (0) according to the execution result (data value) of each
instruction. The CY flag can directly be set/ cleared or inverted by an instruction.
The control flag is set/cleared by an instruction and controls the operation of the V30MZ. The IE flag and BRK flag
are cleared (0) when interrupt servicing is started.
RESET input clears (0) all flags (except MD flag).
The PSW is manipulated in byte units or word units by the processing shown below. Processing in byte units is
only carried out on the lower 8 bits (including the status flags except the V flag).
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