MC68HC908AP16CFA MOTOROLA [Motorola, Inc], MC68HC908AP16CFA Datasheet - Page 138
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MC68HC908AP16CFA
Manufacturer Part Number
MC68HC908AP16CFA
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AP16CFA.pdf
(440 pages)
- Current page: 138 of 440
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System Integration Module (SIM)
9.4 SIM Counter
9.4.1 SIM Counter During Power-On Reset
9.4.2 SIM Counter During Stop Mode Recovery
9.4.3 SIM Counter and Reset States
Data Sheet
138
The SIM counter is used by the power-on reset module (POR) and in
stop mode recovery to allow the oscillator time to stabilize before
enabling the internal bus (IBUS) clocks. The SIM counter also serves as
a prescaler for the computer operating properly module (COP). The SIM
counter overflow supplies the clock for the COP module. The SIM
counter is 13 bits long and is clocked by the falling edge of CGMXCLK.
The power-on reset module (POR) detects power applied to the MCU.
At power-on, the POR circuit asserts the signal PORRST. Once the SIM
is initialized, it enables the clock generation module (CGM) to drive the
bus clock state machine.
The SIM counter also is used for stop mode recovery. The STOP
instruction clears the SIM counter. After an interrupt, break, or reset, the
SIM senses the state of the short stop recovery bit, SSREC, in the mask
option register. If the SSREC bit is a logic 1, then the stop recovery is
reduced from the normal delay of 4096 CGMXCLK cycles down to 32
CGMXCLK cycles. This is ideal for applications using canned oscillators
that do not require long start-up times from stop mode. External crystal
applications should use the full stop recovery time, that is, with SSREC
cleared.
External reset has no effect on the SIM counter.
for details.) The SIM counter is free-running after all reset states.
9.3.2 Active Resets from Internal Sources
internal reset recovery sequences.)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
MC68HC908AP Family — Rev. 2.5
for counter control and
(See 9.6.2 Stop Mode
MOTOROLA
(See
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