mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 102

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

System Integration Module (SIM)
8.4.1 External Pin Reset
Technical Data
102
All of these resets produce the vector $FFFE–FFFF ($FEFE–FEFF in
monitor mode) and assert the internal reset signal (IRST). IRST causes
all registers to be returned to their default values and all modules to be
returned to their reset states.
An internal reset clears the SIM counter (see
external reset does not. Each of the resets sets a corresponding bit in
the SIM reset status register (SRSR). (See
The RST pin circuit includes an internal pullup device. Pulling the
asynchronous RST pin low halts all processing. The PIN bit of the SIM
reset status register (SRSR) is set as long as RST is held low for a
minimum of 67 OSCDCLK cycles, assuming that neither the POR nor
the LVI was the source of the reset. See
Figure 8-4
OSCOUT
RST
IAB
Reset Type
All others
POR/LVI
PC
System Integration Module (SIM)
shows the relative timing.
Figure 8-4. External Reset Timing
Table 8-2. PIN Bit Set Timing
Number of Cycles Required to Set PIN
4163 (4096 + 64 + 3)
Table 8-2
8.8 SIM
67 (64 + 3)
8.5 SIM
MC68HC908JB16
VECT H VECT L
Freescale Semiconductor
for details.
Registers.)
Counter), but an
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Rev. 1.1