TMP86PM74AFG datasheet(39/190 Pages) TOSHIBA

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Page 29

TMP86PM74AFG

(2)

Switching from SLOW1 mode to NORMAL2 mode

Note: After SYSCK is cleared to “0”, executing the instructions is continiued by the low-frequency clock

for the period synchronized with low-frequency and high-frequency clocks.

First, set SYSCR2<XEN> to turn on the high-frequency oscillation. When time for stabilization

(Warm up) has been taken by the timer/counter (TC2), clear SYSCR2<SYSCK> to switch the main

system clock to the high-frequency clock.

SLOW mode can also be released by inputting low level on the RESET pin. After releasing reset, the

operation mode is started from NORMAL1 mode.

Example :Switching from the SLOW1 mode to the NORMAL2 mode (fc = 16 MHz, warm-up time is 4.0 ms).

SET

(SYSCR2). 7

; SYSCR2<XEN>

← 1 (Starts high-frequency oscillation)

(TC2CR), 10H

; Sets mode for TC2 (fc for source)

(TC2DRH), 0F8H

; Sets warm-up time

; IMF

← 0

SET

(EIRH). 5

; Enables INTTC2

; IMF

← 1

SET

(TC2CR). 5

; Starts TC2

PINTTC2:

CLR

(TC2CR). 5

; Stops TC2

CLR

(SYSCR2). 5

; SYSCR2<SYSCK>

← 0

(Switches the main system clock to the high-frequency clock)

RETI

VINTTC2:

PINTTC2

; INTTC2 vector table

High-frequency clock

Low-frequency clock

Main system clock

SYSCK

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