TMP93CS41 datasheet(33/248 Pages) TOSHIBA

33 / 248 page

TMP93CS40/TMP93CS41

2004-02-10

93CS40-31

How to calculate the warm-up time

WDMOD<WARM>

= 0: Clock operation frequency after the 214/STOP mode

WDMOD<WARM>

= 1: Clock operation frequency after the 216/STOP mode

The selection of NORMAL versus SLOW modes is possible after the STOP mode is

released.

This selection is mode according to the contents of the SYSCR0<RSYSCK> register.

Therefore, setting <RSYSCK>, <RXEN>, and <RXTEN> is necessary before the HALT

instruction is executed.

Setting example:

In this illustrative case, the STOP mode is entered while the clock is operating at low

frequency (fs). After the STOP mode is released by a NMI interrupt, the clock resumes

operation at high frequency.

Address

SYSCR0

EQU

006EH

SYSCR1

EQU

006FH

WDMOD

EQU

005CH

8FFDH

(SYSCR1), 08H

; fSYS = fs/2.

9000H

RES

4,(WDMOD)

; Sets warm-up time to 2

14/fc.

9002H

(SYSCR0),

−11000 − − B

; Operates at high frequency after STOP mode

is released.

9005H

HALT

NMI

Clears and starts

warm-up timer

(High frequency)

End

NMI

interrupt routine

9006H

XX, XX

RETI

Note: When different operation modes are used before and after the STOP mode, and halt release

interrupt request is accepted during execution of the HALT instruction (8 states), it is possible to

release the HALT mode without changing the operation mode. In a system which accepts

interrupts during execution of the HALT instruction, set the same operation mode before and after

the STOP mode.

−: No change

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