参数资料
型号: TMP86CH09NG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, 1.78 MM PITCH, LEAD FREE, PLASTIC, SDIP-32
文件页数: 53/120页
文件大小: 1743K
代理商: TMP86CH09NG
Page 27
TMP86FH09ANG
(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 (TC4,TC3), 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)
LD
(TC3CR), 63H
; Sets mode for TC4, 3 (16-bit mode, fc for source)
LD
(TC4CR), 05H
; Sets warming-up counter mode
LD
(TTREG4), 0F8H
; Sets warm-up time
DI
; IMF
0
SET
(EIRH). 3
; Enables INTTC4
EI
; IMF
1
SET
(TC4CR). 3
; Starts TC4, 3
:
PINTTC4:
CLR
(TC4CR). 3
; Stops TC4, 3
CLR
(SYSCR2). 5
; SYSCR2<SYSCK>
0
(Switches the main system clock to the high-frequency clock)
RETI
:
VINTTC4:
DW
PINTTC4
; INTTC4 vector table
High-frequency clock
Low-frequency clock
Main system clock
SYSCK
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