s908gr16ag4cfj Freescale Semiconductor, Inc, s908gr16ag4cfj Datasheet - Page 214

• Manufacturer Part Number: s908gr16ag4cfj
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Timebase Module (TBM)
17.7 Timebase Control Register
The timebase has one register, the timebase control register (TBCR), which is used to enable the
timebase interrupts and set the rate.
TBIF — Timebase Interrupt Flag
TBR2–TBR0 — Timebase Divider Selection Bits
TACK— Timebase Acknowledge Bit
TBIE — Timebase Interrupt Enabled Bit
TBON — Timebase Enabled Bit
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This read-only flag bit is set when the timebase counter has rolled over.
These read/write bits select the tap in the counter to be used for timebase interrupts as shown in
Table
The TACK bit is a write-only bit and always reads as 0. Writing a 1 to this bit clears TBIF, the timebase
interrupt flag bit. Writing a 0 to this bit has no effect.
This read/write bit enables the timebase interrupt when the TBIF bit becomes set. Reset clears the
TBIE bit.
This read/write bit enables the timebase. Timebase may be turned off to reduce power consumption
when its function is not necessary. The counter can be initialized by clearing and then setting this bit.
Reset clears the TBON bit.
1 = Timebase interrupt pending
0 = Timebase interrupt not pending
1 = Clear timebase interrupt flag
0 = No effect
1 = Timebase interrupt is enabled.
0 = Timebase interrupt is disabled.
1 = Timebase is enabled.
0 = Timebase is disabled and the counter initialized to 0s.
17-1.
Address: $001C
Do not change TBR2–TBR0 bits while the timebase is enabled (TBON = 1).
Reset:
Read:
Write:
Bit 7
TBIF
0
Figure 17-2. Timebase Control Register (TBCR)
= Unimplemented
TBR2
6
0
MC68HC908GR16A Data Sheet, Rev. 1.0
TBR1
5
0
NOTE
TBR0
4
0
TACK
3
R
0
0
= Reserved
TBIE
2
0
TBON
1
0
Freescale Semiconductor
Bit 0
R
0