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MC68HC705P9CS датащи(PDF) 113 Page - Freescale Semiconductor, Inc

номер детали MC68HC705P9CS
подробное описание детали  Microcontrollers
PDF  160 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC705P9CS датащи(HTML) 113 Page - Freescale Semiconductor, Inc

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Timer
I/O Registers
MC68HC705P9 — Rev. 4.0
Technical Data
MOTOROLA
Timer
113
9.7.4 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 9-15. 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
54321
Bit 0
Read:
Bit 15
14
13
12
11
10
9
Bit 8
Write:
Reset:
Reset initializes ATRH to $FF
$001B
Bit 7
6
54321
Bit 0
Read:
Bit 7
6
54321
Bit 0
Write:
Reset:
Reset initializes ATRL to $FC
= Unimplemented
Figure 9-14. Alternate Timer Registers (ATRH and ATRL)
ATRH ($001A)
ATRL ($001B)
BUFFER
INTERNAL
DATA BUS
READ ATRH
LATCH
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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