參數(shù)資料
型號: MC68HRC908JL3
廠商: Motorola, Inc.
英文描述: MC68HC908JK1
中文描述: MC68HC908JK1
文件頁數(shù): 77/83頁
文件大小: 1923K
代理商: MC68HRC908JL3
System Integration Module (SIM)
Reset and System Initialization
MC68H(R)C908JL3
Rev. 1.0
Technical Data
MOTOROLA
System Integration Module (SIM)
77
Figure 7-4. External Reset Timing
7.4.2 Active Resets from Internal Sources
All internal reset sources actively pull the RST pin low for 32 2OSCOUT
cycles to allow resetting of external peripherals. The internal reset signal
IRST continues to be asserted for an additional 32 cycles (
An internal reset can be caused by an illegal address, illegal opcode,
COP time-out, or POR. (See
Figure 7-6 . Sources of Internal Reset
Note that for POR resets, the SIM cycles through 4096 2OSCOUT
cycles during which the SIM forces the RST pin low. The internal reset
signal then follows the sequence from the falling edge of RST shown in
Figure 7-5
.
Figure 7-5
).
.)
Figure 7-5. Internal Reset Timing
The COP reset is asynchronous to the bus clock.
Figure 7-6. Sources of Internal Reset
RST
IAB
PC
VECT H
VECT L
OSCOUT
IRST
RST
RST PULLED LOW BY MCU
IAB
32 CYCLES
32 CYCLES
VECTOR HIGH
2OSCOUT
ILLEGAL ADDRESS RST
ILLEGAL OPCODE RST
COPRST
POR
LVI
INTERNAL RESET
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