M68ICS08GR datasheet(291/408 Pages) FREESCALE

291 / 408 page

System Integration Module (SIM)

Low-Power Modes

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

System Integration Module (SIM)

291

wait mode. Some modules can be programmed to be active in wait

mode.

Wait mode also can be exited by a reset or break. A break interrupt

during wait mode sets the SIM break stop/wait bit, SBSW, in the SIM

break status register (SBSR). If the COP disable bit, COPD, in the mask

option register is logic 0, then the computer operating properly module

(COP) is enabled and remains active in wait mode.

Figure 19-15. Wait Mode Entry Timing

Figure 19-16 and Figure 19-17 show the timing for WAIT recovery.

Figure 19-16. Wait Recovery from Interrupt or Break

WAIT ADDR + 1

SAME

IAB

IDB

PREVIOUS DATA

NEXT OPCODE

SAME

WAIT ADDR

SAME

R/W

Note:

Previous data can be operand data or the WAIT opcode, depending on the

last instruction.

$6E0C

$6E0B

$00FF

$00FE

$00FD

$00FC

$A6

$01

$0B

$6E

$A6

IAB

IDB

EXITSTOPWAIT

Note: EXITSTOPWAIT = RST pin, CPU interrupt, or break interrupt

Freescale Semiconductor, Inc.

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Go to: www.freescale.com

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