4559 datasheet(137/148 Pages) RENESAS

137 / 148 page

Rev.1.04

Aug 23, 2007

Page 137 of 146

REJ03B0188-0104

4559 Group

Skip condition

Detailed description

−−

No operation; Adds 1 to program counter value, and others remain unchanged.

−−

Puts the system in clock operating mode by executing the POF instruction after executing the EPOF

instruction.

−−

Puts the system in RAM back-up state by executing the POF2 instruction after executing the EPOF

instruction.

−−

Makes the immediate after POF or POF2 instruction valid by executing the EPOF instruction.

(P) = 1

−

Skips the next instruction when the P flag is “1”.

After skipping, the P flag remains unchanged.

Executes the next instruction when the P flag is “0”.

(WDF1) = 1

Clears (0) to the WDF1 flag and skips the next instruction when watchdog timer flag WDF1 is “1”. When the

WDF1 flag is “0”, executes the next instruction. Also, stops the watchdog timer function when executing the

WRST instruction immediately after the DWDT instruction.

−−

Stops the watchdog timer function by the WRST instruction after executing the DWDT instruction.

−−

System reset occurs.

−−

Clears (0) to the high-order bit reference enable flag UPTF.

−−

Sets (1) to the high-order bit reference enable flag UPTF.

(VDF) = 1

−

Skips the next instruction when voltage drop detection circuit flag VDF is “1”. Execute instruction when VPF

is “0”.

After skipping, the contents of VDF remains unchanged.

−−

Validates the voltage drop detection circuit at power down (clock operating mode and RAM back-up mode).

4559 Datasheet(PDF) 137 Page - Renesas Technology Corp