mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 304

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Timer Interface A (TIMA)
20.9.2 TIMA Counter Registers
Technical Data
302
NOTE:
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 TACNTH is read 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.
Reset:
Reset:
Read:
Read:
Write:
Write:
Register Name and Address: TACNTH — $0022
Register Name and Address: TACNTL — $0023
Figure 20-5. TIMA Counter Registers (TACNTH and TACNTL)
Bit 15
Bit 7
Bit 7
Bit 7
R
R
R
0
0
Timer Interface A (TIMA)
= Reserved
14
R
R
6
0
6
6
0
13
R
R
5
0
5
5
0
12
R
R
4
0
4
4
0
11
R
R
3
0
3
3
0
Freescale Semiconductor
10
R
R
2
0
2
2
0
MC68HC08QA24
R
R
1
9
0
1
1
0
Bit 0
Bit 8
Bit 0
Bit 0
R
R
0
0