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參數(shù)資料
| 型號(hào)： | TMP86CH09NG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | 0.400 INCH, 1.78 MM PITCH, LEAD FREE, PLASTIC, SDIP-32 |
| 文件頁(yè)數(shù)： | 52/120頁(yè) |
| 文件大?。?/td> | 1743K |
| 代理商： | TMP86CH09NG |
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Page 26
2. Operational Description
2.2 System Clock Controller
TMP86FH09ANG
2.2.4.4 SLOW mode
SLOW mode is controlled by the system control register 2 (SYSCR2).
The following is the methods to switch the mode with the warm-up counter.
(1) Switching from NORMAL2 mode to SLOW1 mode
First, set SYSCR2<SYSCK> to switch the main system clock to the low-frequency clock for
SLOW2 mode. Next, clear SYSCR2<XEN> to turn off high-frequency oscillation.
Note: The high-frequency clock can be continued oscillation in order to return to NORMAL2 mode from
SLOW mode quickly. Always turn off oscillation of high-frequency clock when switching from
SLOW mode to stop mode.
Example 1 :Switching from NORMAL2 mode to SLOW1 mode.
SET
(SYSCR2). 5
; SYSCR2<SYSCK>
← 1
(Switches the main system clock to the low-frequency
clock for SLOW2)
CLR
(SYSCR2). 7
; SYSCR2<XEN>
← 0
(Turns off high-frequency oscillation)
Example 2 :Switching to the SLOW1 mode after low-frequency clock has stabilized.
SET
(SYSCR2). 6
; SYSCR2<XTEN>
← 1
LD
(TC3CR), 43H
; Sets mode for TC4, 3 (16-bit mode, fs for source)
LD
(TC4CR), 05H
; Sets warming-up counter mode
LDW
(TTREG3), 8000H
; Sets warm-up time (Depend on oscillator accompanied)
DI
; IMF
← 0
SET
(EIRH). 3
; Enables INTTC4
EI
; IMF
← 1
SET
(TC4CR). 3
; Starts TC4, 3
:
PINTTC4:
CLR
(TC4CR). 3
; Stops TC4, 3
SET
(SYSCR2). 5
; SYSCR2<SYSCK>
← 1
(Switches the main system clock to the low-frequency clock)
CLR
(SYSCR2). 7
; SYSCR2<XEN>
← 0
(Turns off high-frequency oscillation)
RETI
:
VINTTC4:
DW
PINTTC4
; INTTC4 vector table
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