MC68HC705C8ACS

Manufacturer Part NumberMC68HC705C8ACS
ManufacturerFreescale Semiconductor, Inc
MC68HC705C8ACS datasheet
 


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Freescale Semiconductor, Inc.
Register Name and Address: Alternate Timer Register High — $001A
Read:
Write:
Reset:
Register Name and Address: Alternate Timer Register Low — $001B
Read:
Write:
Reset:
Figure 8-9. Alternate Timer Registers (ATRH and ATRL)
Reading ATRH returns the current value of the high byte of the counter
and causes the low byte to be latched into a buffer, as shown in
Figure
$001A
NOTE:
To prevent interrupts from occurring 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.
MC68HC705C8A — Rev. 3
MOTOROLA
For More Information On This Product,
Bit 7
6
5
4
Bit 15
Bit 14
Bit 13
Bit 12
Reset initializes ATRH to $FF
Bit 7
Bit 6
Bit 5
Bit 4
Reset initializes ATRL to $FC
= Unimplemented
8-10.
INTERNAL DATA BUS
LATCH
15
8
ALTERNATE TIMER REGISTER HIGH
READ ATRH
Figure 8-10. Alternate Timer Register Reads
Capture/Compare Timer
Go to: www.freescale.com
Capture/Compare Timer
Timer I/O Registers
3
2
1
Bit 0
Bit 11
Bit 10
Bit 9
Bit 8
Bit 3
Bit 2
Bit 1
Bit 0
7
0
LOW BYTE BUFFER
7
0
ALTERNATE TIMER REGISTER LOW
$001B
Technical Data