mc68hc08az60 Freescale Semiconductor, Inc, mc68hc08az60 Datasheet - Page 260

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

T imer Interface Module B(TIMB)
TIMB Counter
Registers
MC68HC08AZ60 — Rev 1.0
260
NOTE:
PS[2:0] — Prescaler Select Bits
The two read-only TIMB counter registers contain the high and low bytes
of the value in the TIMB counter. Reading the high byte (TBCNTH)
latches the contents of the low byte (TBCNTL) into a buffer. Subsequent
reads of TBCNTH do not affect the latched TBCNTL value until TBCNTL
is read. Reset clears the TIMB counter registers. Setting the TIMB reset
bit (TRST) also clears the TIMB counter registers.
If TBCNTH is read during a break interrupt, be sure to unlatch TBCNTL
by reading TBCNTL before exiting the break interrupt. Otherwise,
TBCNTL retains the value latched during the break.
Reset:
Read:
Write:
Register Name and Address TBCNTH — $0041
Freescale Semiconductor, Inc.
These read/write bits select either the PTD4/TBLCK pin or one of the
seven prescaler outputs as the input to the TIMB counter as
shows. Reset clears the PS[2:0] bits.
Figure 5. TIMB Counter Registers (TBCNTH and TBCNTL)
For More Information On This Product,
BIT 15
Bit 7
R
0
Timer Interface Module B (TIMB)
PS[2:0]
Go to: www.freescale.com
000
001
010
011
100
101
110
111
BIT 14
R
6
0
Table 1. Prescaler Selection
BIT 13
R
5
0
BIT 12
R
4
0
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock
Internal Bus Clock 1
TIMB Clock Source
BIT 11
R
3
0
PTD4/TBLCK
BIT 10
R
2
0
16
32
64
2
4
8
BIT 9
R
1
0
MOTOROLA
Table 1
BIT 8
Bit 0
18-timb
R
0