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M68HC08 Datasheet(PDF) 139 Page - Freescale Semiconductor, Inc

Part # M68HC08
Description  Microcontrollers
PDF  288 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68HC08 Datasheet(HTML) 139 Page - Freescale Semiconductor, Inc

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Timer Interface Module (TIM)
MC68HC908BD48 — Rev. 2.1
Data Sheet
Freescale Semiconductor
Timer Interface Module (TIM)
139
10.10.2 TIM Counter Registers (TCNTH:TCNTL)
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.
NOTE:
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.
Table 10-3. Prescaler Selection
PS2
PS1
PS0
TIM Clock Source
0
0
0
Internal Bus Clock ÷ 1
0
0
1
Internal Bus Clock ÷ 2
0
1
0
Internal Bus Clock ÷ 4
0
1
1
Internal Bus Clock ÷ 8
1
0
0
Internal Bus Clock ÷ 16
1
0
1
Internal Bus Clock ÷ 32
1
1
0
Internal Bus Clock ÷ 64
1
1
1
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