mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 198

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Timer Interface Module (TIM)
11.10.2 TIM Counter Registers
Data Sheet
198
NOTE:
Address: T1CNTH, $0021 and T2CNTH, $002C
Address: T1CNTL, $0022 and T2CNTL, $002D
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.
Reset:
Reset:
Read:
Read:
Write:
Write:
Bit 15
Figure 11-5. TIM Counter Registers High (TCNTH)
Figure 11-6. TIM Counter Registers Low (TCNTL)
Bit 7
Bit 7
Bit 7
0
0
Timer Interface Module (TIM)
= Unimplemented
= Unimplemented
14
6
0
6
6
0
13
5
0
5
5
0
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
12
4
0
4
4
0
11
3
0
3
3
0
Freescale Semiconductor
10
2
0
2
2
0
1
9
0
1
1
0
Bit 0
Bit 8
Bit 0
Bit 0
0
0