RL78/G10 CHAPTER 3 CPU ARCHITECTURE
R01UH0384EJ0311 Rev. 3.11 32
Dec 22, 2016
3.2 Processor Registers
The RL78/G10 products incorporate the following processor registers.
3.2.1 Control registers
The control registers control the program sequence, statuses and stack memory. The control registers consist of a
program counter (PC), a program status word (PSW) and a stack pointer (SP).
(1) Program counter (PC)
The program counter is a 20-bit register that holds the address information of the next program to be executed.
In normal operation, PC is automatically incremented according to the number of bytes of the instruction to be fetched.
When a branch instruction is executed, immediate data and register contents are set.
Reset signal generation sets the reset vector table values at addresses 0000H and 0001H to the 16 lower-order bits
of the program counter. The four higher-order bits of the program counter are cleared to 0000.
Figure 3-5. Format of Program Counter
19
PC
0
(2) Program status word (PSW)
The program status word is an 8-bit register consisting of various flags set/reset by instruction execution.
Program status word contents are stored in the stack area upon acknowledgment of a vectored interrupt request or
PUSH PSW instruction execution, and are restored upon execution of the RETB, RETI and POP PSW instructions.
Reset signal generation sets the PSW register to 06H.
Figure 3-6. Format of Program Status Word
7
PSW
CYIE
Z0 0AC ISP1
ISP0
0
(a) Interrupt enable flag (IE)
This flag controls the interrupt request acknowledge operations of the CPU.
When 0, the IE flag is set to the interrupt disabled (DI) state, and all maskable interrupt requests are disabled.
When 1, the IE flag is set to the interrupt enabled (EI) state, and maskable interrupt request acknowledgment is
controlled with an in-service priority flag (ISP1, ISP0), an interrupt mask flag for various interrupt sources, and a
priority specification flag.
The IE flag is reset (0) upon DI instruction execution or interrupt acknowledgment and is set (1) upon EI
instruction execution.
(b) Zero flag (Z)
When the operation or comparison result is zero or equal, this flag is set (1). It is reset (0) in all other cases.
(c) Auxiliary carry flag (AC)
If the operation result has a carry from bit 3 or a borrow at bit 3, this flag is set (1). It is reset (0) in all other cases.
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