mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 206
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mc68hc908sr12
Manufacturer Part Number
mc68hc908sr12
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908SR12.pdf
(404 pages)
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Timebase Module (TBM)
12.4 Functional Description
Data Sheet
206
(See
From OSC module
OSCCLK
Section 7. Oscillator
÷ 2
÷ 2
÷ 2
÷ 2
(OSC).)
÷ 2
÷ 2
This module can generate a periodic interrupt by dividing the oscillator
clock frequency, OSCCLK. The counter is initialized to all 0s when
TBON bit is cleared. The counter, shown in
when the 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.
The reference clock OSCCLK is derived from the oscillator module, see
7.3.2 TBM Reference Clock
÷ 2
Figure 12-1. Timebase Block Diagram
÷ 8
÷ 32768
÷ 2
÷ 2
÷ 16
÷ 65536
÷ 2
Timebase Module (TBM)
÷ 2
÷ 32
÷ 131072
÷ 2
÷ 2
÷ 64
÷ 2
÷ 262144
Selection.
÷ 2
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
÷ 2
÷ 2
SEL
Figure
÷ 2
÷ 2048
Freescale Semiconductor
12-1, starts counting
R
TBIF
TBMINT
TBON
TBIE
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