MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 210

• Manufacturer Part Number: MC68HC908LK24
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Timer Interface Module (TIM)
11.10.2 TIM Counter Registers
Data Sheet
210
NOTE:
Address: T1CNTH, $0021 and T2CNTH, $002C
PS[2:0] — Prescaler Select Bits
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:
Read:
Write:
Freescale Semiconductor, Inc.
These read/write bits select one of the seven prescaler outputs as the
input to the TIM counter as
PS[2:0] bits.
PS2
0
0
0
0
1
1
1
1
For More Information On This Product,
Bit 15
Figure 11-5. TIM Counter Registers High (TCNTH)
Bit 7
0
Timer Interface Module (TIM)
Go to: www.freescale.com
PS1
0
0
1
1
0
0
1
1
= Unimplemented
14
6
0
Table 11-2. Prescaler Selection
PS0
0
1
0
1
0
1
0
1
13
5
0
Table 11-2
12
4
0
Internal bus clock ÷ 1
Internal bus clock ÷ 2
Internal bus clock ÷ 4
Internal bus clock ÷ 8
Internal bus clock ÷ 16
Internal bus clock ÷ 32
Internal bus clock ÷ 64
shows. Reset clears the
11
3
0
TIM Clock Source
MC68HC908LJ24/LK24 — Rev. 2
TCLK
10
2
0
1
9
0
MOTOROLA
Bit 0
Bit 8
0