mc9s12c32mpb16 Freescale Semiconductor, Inc, mc9s12c32mpb16 Datasheet - Page 283

• Manufacturer Part Number: mc9s12c32mpb16
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Definition.” All reset sources are listed in
vector addresses and priorities.
The reset sequence is initiated by any of the following events:
Upon detection of any reset event, an internal circuit drives the RESET pin low for 128 SYSCLK cycles
(see
However, the internal reset circuit of the CRGV4 cannot sequence out of current reset condition without a
running SYSCLK. The number of 128 SYSCLK cycles might be increased by n = 3 to 6 additional
SYSCLK cycles depending on the internal synchronization latency. After 128+n SYSCLK cycles the
RESET pin is released. The reset generator of the CRGV4 waits for additional 64 SYSCLK cycles and
then samples the RESET pin to determine the originating source.
fetched.
Freescale Semiconductor
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Figure
Low level is detected at the RESET pin (external reset).
Power on is detected.
Low voltage is detected.
COP watchdog times out.
Clock monitor failure is detected and self-clock mode was disabled (SCME = 0).
9-25). Because entry into reset is asynchronous it does not require a running SYSCLK.
External circuitry connected to the RESET pin should not include a large
capacitance that would interfere with the ability of this signal to rise to a
valid logic 1 within 64 SYSCLK cycles after the low drive is released.
Sampled RESET Pin
(64 Cycles After
Release)
1
1
1
0
COP Watchdog Reset
Clock Monitor Reset
Low Voltage Reset
Power-on Reset
External Reset
Reset Source
Table 9-14. Reset Vector Selection
MC9S12C-Family / MC9S12GC-Family
Reset Pending
Clock Monitor
Table 9-13. Reset Summary
Table
X
0
1
0
9-13. Refer to the device overview chapter for related
Rev 01.23
NOTE
PLLCTL (CME=1, SCME=0)
COPCTL (CR[2:0] nonzero)
Chapter 9 Clocks and Reset Generator (CRGV4) Block Description
COP Reset
Pending
Local Enable
X
X
0
1
None
None
None
POR / LVR / External Reset
Clock Monitor Reset
COP Reset
POR / LVR / External Reset
with rise of RESET pin
Table 9-14
Vector Fetch
shows which vector will be
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