参数资料
型号: MC68HC05C9AB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
封装: SHRINK, PLASTIC, DIP-42
文件页数: 123/160页
文件大小: 4128K
代理商: MC68HC05C9AB
Capture/Compare Timer
Timer I/O Registers
MC68HC05C9A Rev. 4.0
General Release Specification
Capture/Compare Timer
NON-DISCLOSURE
AGREEMENT
REQUIRED
8.4.5 Input Capture Registers (ICRH and ICRL)
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.
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:
BIT15
BIT14
BIT13
BIT12
BIT11
BIT10
BIT9
BIT8
Write:
ICRL
$0015
Bit 7
6
5
4
3
2
1
Bit 0
Read:
BIT7
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
BIT0
Write:
RESET DOES NOT AFFECT THE INPUT CAPTURE REGISTERS
= Unimplemented
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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