參數資料
型號: MC68HC05P9AP
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數: 99/158頁
文件大?。?/td> 1106K
代理商: MC68HC05P9AP
Timer
I/O Registers
MOTOROLA
Timer
99
Alternate Timer
Registers
The read-only alternate timer registers (ATRH and ATRL) contain the
current high and low bytes of the 16-bit counter. Reading ATRH before
reading ATRL causes ATRL to be latched until ATRL is read. Reading
does not affect the timer overflow flag (TOF). Writing to the alternate
timer registers has no effect.
Reading ATRH returns the current value of the high byte of the counter
and causes the low byte to be latched into a buffer.
Figure 56. Alternate Timer Register Reads
NOTE:
To prevent interrupts between readings of ATRH and ATRL, set the
interrupt mask (I bit) in the condition code register before reading ATRH,
and clear the mask after reading ATRL.
$001A
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 15
14
13
12
11
10
9
Bit 8
Write:
Reset:
Reset initializes ATRH to $FF
$001B
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
6
5
4
3
2
1
Bit 0
Write:
Reset:
Reset initializes ATRL to $FC
= Unimplemented
Figure 55. Alternate Timer Registers (ATRH and ATRL)
ATRH ($001A)
ATRL ($001B)
BUFFER
INTERNAL
DATA BUS
READ ATRH
LATCH
19-tim1ic1oc_a
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
相關PDF資料
PDF描述
MC68HC08AS20 M68HC08 Microcontrollers
MC68HC08AZ48CFU Advance Information
MC68HC08AZ48MFU Advance Information
MC68HC08AZ48VFU Advance Information
MC68HC08AS32VFU M68HC08 Family of 8-bit microcontroller units (MCUs)
相關代理商/技術參數
參數描述
MC68HC05P9AVDW 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05P9AVP 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05P9DW 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT
MC68HC05P9P 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT
MC68HC05PV8 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Techinal Data - rev 1.9