MC68HC908GP32_08 Datasheet, PDF (196/266 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Timebase Module (TBM)
CGMXCLK
÷2 ÷2 ÷2
÷2
÷2
÷2
÷2
÷8
÷ 16
÷ 32
÷ 64
÷ 128
TBON
TBMINT
÷2 ÷2 ÷2 ÷2
÷2 ÷2
÷2 ÷2
÷ 2048
÷ 8192
÷ 32768
000
001
010
011
1 0 0 ^SEL
101
110
111
TBIF
TBIE
R
Figure 16-1. Timebase Block Diagram
16.4 Timebase Register Description
The timebase has one register, the TBCR, which is used to enable the timebase interrupts and set the
rate.
Address: $001C
Bit 7
6
5
4
3
2
1
Bit 0
Read: TBIF
0
TBR2
TBR1
TBR0
TBIE
TBON
R
Write:
TACK
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
R
= Reserved
Figure 16-2. Timebase Control Register (TBCR)
TBIF — Timebase Interrupt Flag
This read-only flag bit is set when the timebase counter has rolled over.
1 = Timebase interrupt pending
0 = Timebase interrupt not pending
MC68HC908GP32 Data Sheet, Rev. 10
196
Freescale Semiconductor