MC68HC908GR4 MOTOROLA [Motorola, Inc], MC68HC908GR4 Datasheet - Page 330
MC68HC908GR4
Manufacturer Part Number
MC68HC908GR4
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908GR4.pdf
(408 pages)
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Timebase Module (TBM)
21.4 Functional Description
Technical Data
330
CGMXCLK
NOTE:
2
2
2
2
2
This module is designed for a 32.768 kHz oscillator.
This module can generate a periodic interrupt by dividing the crystal
frequency, CGMXCLK. The counter is initialized to all 0s when TBON bit
is cleared. The counter, shown in
TBON bit is set. When the counter overflows at the tap selected by
TBR2:TBR0, the TBIF bit gets set. If the TBIE bit is set, an interrupt
request is sent to the CPU. The TBIF flag is cleared by writing a 1 to the
TACK bit. The first time the TBIF flag is set after enabling the timebase
module, the interrupt is generated at approximately half of the overflow
period. Subsequent events occur at the exact period.
2
Freescale Semiconductor, Inc.
2
Figure 21-1. Timebase Block Diagram
For More Information On This Product,
2
2
Go to: www.freescale.com
Timebase Module (TBM)
2
2
2
2
2
2
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Figure
21-1, starts counting when the
MC68HC908GR8 — Rev 4.0
TBON
R
TBIF
TBMINT
MOTOROLA
TBIE
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