參數(shù)資料
型號(hào)： MC68HC05P9ACP
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝： PLASTIC, DIP-28
文件頁數(shù)： 157/158頁
文件大小： 3885K
代理商： MC68HC05P9ACP
Timer
98
Timer
Timer Registers
The read-only timer registers (TRH and TRL) contain the current high
and low bytes of the 16-bit counter. Reading TRH before reading TRL
causes TRL to be latched until TRL is read. Reading TRL after reading
the timer status register clears the timer overflow flag (TOF). Writing to
the timer registers has no effect.
Reading TRH returns the current value of the high byte of the counter
and causes the low byte to be latched into a buffer. The buffer value
remains fixed even if the high byte is read more than once. Reading TRL
reads the transparent low byte buffer and completes the read sequence
of the timer registers.
Figure 54. Timer Register Reads
NOTE:
To prevent interrupts from occurring between readings of TRH and TRL,
set the interrupt mask (I bit) in the condition code register before reading
TRH, and clear the mask after reading TRL.
$0018
Bit 7
654321
Bit 0
Read:
Bit 15
14
13
12
11
10
9
Bit 8
Write:
Reset:
Reset initializes TRH to $FF
$0019
Bit 7
654321
Bit 0
Read:
Bit 7
654321
Bit 0
Write:
Reset:
Reset initializes TRL to $FC
= Unimplemented
Figure 53. Timer Registers (TRH and TRL)
TRH ($0018)
TRL ($0019)
BUFFER
INTERNAL
DATA BUS
READ TRH
LATCH
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For More Information On This Product,
Go to: www.freescale.com
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