參數(shù)資料
型號: MC68HC05C9AFN
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 131/162頁
文件大?。?/td> 1093K
代理商: MC68HC05C9AFN
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Capture/Compare Timer
Advance Information
MC68HC05C9A Rev. 5.0
70
Capture/Compare Timer
MOTOROLA
8.4.6 Output Compare Registers
When the value of the 16-bit counter matches the value in the output
compare registers, the planned TCMP pin action takes place. Writing to
OCRH before writing to OCRL inhibits timer compares until OCRL is
written. Reading or writing to OCRL after the timer status register clears
the output compare flag (OCF).
Figure 8-7. Output Compare Registers (OCRH and OCRL)
To prevent OCF from being set between the time it is read and the time
the output compare registers are updated, use this procedure:
1. Disable interrupts by setting the I bit in the CCR.
2. Write to OCRH. Compares are now inhibited until OCRL is written.
3. Clear bit OCF by reading timer status register (TSR).
4. Enable the output compare function by writing to OCRL.
5. Enable interrupts by clearing the I bit in the CCR.
Address:
$0016 — OCRH
Bit 7
6
54
32
1
Bit 0
Write:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Read:
Reset:
Unaffected by reset
Address:
$0017 — OCRL
Bit 7
6
54
32
1
Bit 0
Write:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Read:
Reset:
Unaffected by reset
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