mc68hc708mp16 Freescale Semiconductor, Inc, mc68hc708mp16 Datasheet - Page 217

• Manufacturer Part Number: mc68hc708mp16
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

11.9.2 TIMA Counter Registers
MC68HC708MP16
Freescale Semiconductor
NOTE:
—
Rev. 3.1
TACNTH
The two read-only TIMA counter registers contain the high and low bytes
of the value in the TIMA counter. Reading the high byte (TACNTH)
latches the contents of the low byte (TACNTL) into a buffer. Subsequent
reads of TACNTH do not affect the latched TACNTL value until TACNTL
is read. Reset clears the TIMA counter registers. Setting the TIMA reset
bit (TRST) also clears the TIMA counter registers.
If you read TACNTH during a break interrupt, be sure to unlatch TACNTL
by reading TACNTL before exiting the break interrupt. Otherwise,
TACNTL retains the value latched during the break.
TACNTL
$000D
Reset:
$000E
Reset:
Read:
Write:
Read:
Write:
Figure 11-5. TIMA Counter Registers (TACNTH:TACNTL)
Bit 15
Bit 7
Bit 7
Bit 7
Timer Interface Module A (TIMA)
0
0
= Unimplemented
Bit 14
Bit 6
6
0
6
0
Bit 13
Bit 5
5
0
5
0
Bit 12
Bit 4
4
0
4
0
Bit 11
Bit 3
3
0
3
0
Timer Interface Module A (TIMA)
Bit 10
Bit 2
2
0
2
0
Bit 9
Bit 1
Technical Data
1
0
1
0
Bit 0
Bit 0
Bit 8
Bit 0
0
0
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