參數(shù)資料
型號: MC68HC705C9ACP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: Microcontrollers
中文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 81/160頁
文件大?。?/td> 2076K
代理商: MC68HC705C9ACP
Capture/Compare Timer
Timer I/O Registers
MC68HC705C9A — Rev. 4.0
Advance Information
MOTOROLA
Capture/Compare Timer
For More Information On This Product,
Go to: www.freescale.com
81
8.4.5 Input Capture Registers
When a selected edge occurs on the TCAP pin, the current high and low
bytes of the 16-bit counter are latched into the input capture registers
(ICRH and ICRL). Reading ICRH before reading ICRL inhibits further
capture until ICRL is read. Reading ICRL after reading the status register
clears the input capture flag (ICF). Writing to the input capture registers
has no effect.
Figure 8-6. Input Capture Registers (ICRH and ICRL)
NOTE:
To prevent interrupts from occurring between readings of ICRH and
ICRL, set the interrupt flag in the condition code register before reading
ICRH, and clear the flag after reading ICRL.
ICRH
$0014
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Write:
Reset:
Unaffected by reset
ICRL
$0015
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
Unaffected by reset
= Unimplemented
F
Freescale Semiconductor, Inc.
n
.
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