NEC PD78F9488 Manuale Utente
CHAPTER 3 CPU ARCHITECTURE
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User’s Manual U15331EJ4V1UD
3.2 Processor Registers
The
µ
PD789489 Subseries is provided with the following on-chip processor registers.
3.2.1 Control registers
The control registers contain special functions to control the program sequence status and stack memory. The
program counter, program status word, and stack pointer are control registers.
(1) Program counter (PC)
The program counter is a 16-bit register that holds the address information of the next program to be
executed.
In normal operation, the PC is automatically incremented according to the number of bytes of the instruction
to be fetched. When a branch instruction is executed, immediate data or register contents are set.
RESET input sets the reset vector table values at addresses 0000H and 0001H to the program counter.
executed.
In normal operation, the PC is automatically incremented according to the number of bytes of the instruction
to be fetched. When a branch instruction is executed, immediate data or register contents are set.
RESET input sets the reset vector table values at addresses 0000H and 0001H to the program counter.
Figure 3-9. Program Counter Configuration
0
15
PC14
PC15
PC
PC13 PC12 PC11 PC10
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
(2) Program status word (PSW)
The program status word is an 8-bit register consisting of various flags to be set/reset by instruction
execution.
The program status word contents are automatically stacked upon interrupt request generation or PUSH
PSW instruction execution and are automatically restored upon execution of the RETI and POP PSW
instructions.
RESET input sets PSW to 02H.
execution.
The program status word contents are automatically stacked upon interrupt request generation or PUSH
PSW instruction execution and are automatically restored upon execution of the RETI and POP PSW
instructions.
RESET input sets PSW to 02H.
Figure 3-10. Program Status Word Configuration
7
0
IE
Z
0
AC
0
0
1
CY
PSW