mc68hc908rf2 Freescale Semiconductor, Inc, mc68hc908rf2 Datasheet - Page 141

• Manufacturer Part Number: mc68hc908rf2
• Description: M68hc08 Microcontrollers Microcontroller / Transmitter
• Manufacturer: Freescale Semiconductor, Inc

11.8.2 TIM Counter Registers
MC68HC908RF2 — Rev. 4.0
MOTOROLA
NOTE:
The two read-only TIM counter registers contain the high and low bytes of the value
in the TIM counter. Reading the high byte (TCNTH) latches the contents of the low
byte (TCNTL) into a buffer. Subsequent reads of TCNTH do not affect the latched
TCNTL value until TCNTL is read. Reset clears the TIM counter registers. Setting
the TIM reset bit (TRST) also clears the TIM counter registers
If you read TCNTH during a break interrupt, be sure to unlatch TCNTL by reading
TCNTL before exiting the break interrupt. Otherwise, TCNTL retains the value
latched during the break.
Register Name and Address: TCNTH—$0021
Register Name and Address: TCNTL—$0022
Reset:
Reset:
Read:
Read:
Write:
Write:
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 11-6. TIM Counter Registers (TCNTH and TCNTL)
Bit 15
Bit 7
Bit 7
Bit 7
0
0
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Timer Interface Module (TIM)
= Unimplemented
14
6
0
6
6
0
13
5
0
5
5
0
12
4
0
4
4
0
11
3
0
3
3
0
Timer Interface Module (TIM)
10
2
0
2
2
0
1
9
0
1
1
0
I/O Registers
Data Sheet
Bit 0
Bit 8
Bit 0
Bit 0
0
0
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