UPD78F9418AGK-9EU Renesas Electronics America, UPD78F9418AGK-9EU Datasheet - Page 56

• Manufacturer Part Number: UPD78F9418AGK-9EU
• Manufacturer: Renesas Electronics America

Specifications of UPD78F9418AGK-9EU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

3.2 Processor Registers
3.2.1 Control registers
program counter, a program status word, and a stack pointer constitute the control registers.
54
The PD789407A and PD789417A Subseries are provided with the following on-chip processor registers.
The control registers contains special functions to control the program sequence statuses and stack memory. A
(1)
(2)
PC
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 program counter to the reset vector table values at addresses 0000H and 0001H.
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 the PSW to 02H.
PC15
15
PC14
PC13 PC12 PC11 PC10 PC9
IE
7
Figure 3-10. Program Status Word Configuration
Figure 3-9. Program Counter Configuration
Z
CHAPTER 3 CPU ARCHITECTURE
User’s Manual U13952EJ3V1UD
0
AC
PC8
PC7
0
PC6
0
PC5
1
PC4
CY
0
PC3
PC2
PC1
PC0
0