mc68hc08az60 Freescale Semiconductor, Inc, mc68hc08az60 Datasheet - Page 382

• Manufacturer Part Number: mc68hc08az60
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

T imer Interface Module A (TIMA-6)
TIMA Counter
Registers
MC68HC08AZ60 — Rev 1.0
382
NOTE:
NOTE:
Setting the TSTOP and TRST bits simultaneously stops the TIMA
counter at a value of $0000.
PS[2:0] — Prescaler Select Bits
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.
Freescale Semiconductor, Inc.
These read/write bits select either the PTD6/TACLK pin or one of the
seven prescaler outputs as the input to the TIMA counter as
shows. Reset clears the PS[2:0] bits.
For More Information On This Product,
Timer Interface Module A (TIMA-6)
PS[2:0]
Go to: www.freescale.com
000
001
010
011
100
101
110
111
Table 1. Prescaler Selection
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock 1
TIMA Clock Source
PTD6/TACLK
16
32
64
2
4
8
MOTOROLA
Table 1
20-tima-6