CHAPTER 3 CPU ARCHITECTURE
User's Manual U11919EJ3V0UM00
53
3.2 Processor Registers
The
µ
PD789026 Subseries provides the following on-chip processor registers:
3.2.1 Control registers
The control registers contains special functions to control the program sequence statuses and stack memory. A
program counter, a program status word, and a stack pointer are control registers.
(1)
Program counter (PC)
The program counter is a 16-bit register which 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 is set.
RESET input sets the reset vector table values at addresses 0000H and 0001H to the program counter.
Figure 3-11. Program Counter Configuration
(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.
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 3-12. Program Status Word Configuration
0
15
PC14
PC15
PC
PC13 PC12 PC11 PC10
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
7
0
IE
Z
0
AC
0
0
1
CY
PSW
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