Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario descargar pdf (Pagina 165)

7 DETAILS OF INSTRUCTIONS

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

157

slp

Function

SLEEP

Standard) Place the processor in SLEEP mode

Extension 1) Unusable

Extension 2) Unusable

Code

15 12 11 8 7 4 3 0

0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0

0x0040

Flag

IE C V Z N

– – – –

–

Mode

–

CLK

Five cycles

Description

Places the processor in SLEEP mode for power saving.

Program execution is halted at the same time that the C33 PE Core executes the

slp instruction,

and the processor enters SLEEP mode.

SLEEP mode commonly turns off the C33 PE Core and on-chip peripheral circuit operations,

thereby it significantly reduces the current consumption in comparison to the HALT mode.

Initial reset is one cause that can bring the processor out of SLEEP mode. Other causes depend on

the implementation of the clock control circuit outside the C33 PE Core.

Initial reset, maskable external interrupts, NMI, and debug exceptions are commonly used for

canceling SLEEP mode.

The interrupt enable/disable status set in the processor does not affect the cancellation of SLEEP

mode even if an interrupt signal is used as the cancellation. In other words, interrupt signals are

able to cancel SLEEP mode even if the IE flag in PSR or the interrupt enable bits in the interrupt

controller (depending on the implementation) are set to disable interrupts.

When the processor is taken out of SLEEP mode using an interrupt that has been enabled (by the

interrupt controller and IE flag), the corresponding interrupt handler routine is executed. Therefore,

when the interrupt handler routine is terminated by the

reti instruction, the processor returns to

the instruction next to

slp.

When the interrupt has been disabled, the processor restarts the program from the instruction next

to slp after the processor is taken out of SLEEP mode.

Refer to the technical manual of each model for details of SLEEP mode.

Example

slp ; The processor is placed in SLEEP mode.

1 2 ... 160 161 162 163 164 165 166 167 168 169 170 ... 180 181

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