mc68hc708mp16 Freescale Semiconductor, Inc, mc68hc708mp16 Datasheet - Page 88

• Manufacturer Part Number: mc68hc708mp16
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

System Integration Module (SIM)
7.4.2 Active Resets from Internal Sources
Technical Data
88
All internal reset sources actively pull the RST pin low for 32 CGMXCLK
cycles to allow resetting of external peripherals. The internal reset signal
IRST continues to be asserted for an additional 32 cycles. (See
7-5.) An internal reset can be caused by an illegal address, illegal
opcode, COP timeout, LVI, or POR. (See
or POR resets, the SIM cycles through 4096 CGMXCLK 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
The COP reset is asynchronous to the bus clock.
The active reset feature allows the part to issue a reset to peripherals
and other chips within a system built around the MCU.
CGMXCLK
IRST
RST
IAB
System Integration Module (SIM)
Figure 7-6. Sources of Internal Reset
Figure 7-5. Internal Reset Timing
ILLEGAL ADDRESS RST
ILLEGAL OPCODE RST
RST PULLED LOW BY MCU
32 CYCLES
COPRST
POR
LVI
Figure
INTERNAL RESET
32 CYCLES
MC68HC708MP16
7-6.) Note that for LVI
Freescale Semiconductor
VECTOR HIGH
Figure
—
Figure
Rev. 3.1
7-5.