参数资料
型号: MC68HC705P6AS
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, SDIP-28
文件页数: 102/130页
文件大小: 1541K
代理商: MC68HC705P6AS
Capture/Compare Timer
Timer I/O Registers
MC68HC705P6A — Rev. 2.0
Advance Information
MOTOROLA
Capture/Compare Timer
73
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.
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.
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.
Address:
ICRH — $0014
Bit 7
6
54
32
1
Bit 0
Read:
ICRH7
ICRH6
ICRH5
ICRH4
ICRH3
ICRH2
ICRH1
ICRH0
Write:
Unaffected by reset
Address:
ICRL — $0015
Bit 7
6
54
32
1
Bit 0
Write:
Unaffected by reset
= Unimplemented
Figure 8-6. Input Capture Registers (ICRH and ICRL)
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