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M68ICS08GR Fiches technique(PDF) 278 Page - Freescale Semiconductor, Inc

No de pièce M68ICS08GR
Description  M68HC08 Microcontrollers
PDF  408 Pages
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68ICS08GR Fiches technique(HTML) 278 Page - Freescale Semiconductor, Inc

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System Integration Module (SIM)
Technical Data
MC68HC908GR8 — Rev 4.0
278
System Integration Module (SIM)
MOTOROLA
then follows the sequence from the falling edge of RST shown in Figure
19-5.
Figure 19-5. Internal Reset Timing
The COP reset is asynchronous to the bus clock.
Figure 19-6. Sources of Internal Reset
The active reset feature allows the part to issue a reset to peripherals
and other chips within a system built around the MCU.
19.4.2.1 Power-On Reset
When power is first applied to the MCU, the power-on reset module
(POR) generates a pulse to indicate that power-on has occurred. The
external reset pin (RST) is held low while the SIM counter counts out
4096 CGMXCLK cycles. Sixty-four CGMXCLK cycles later, the CPU and
memories are released from reset to allow the reset vector sequence to
occur.
At power-on, these events occur:
•
A POR pulse is generated.
IRST
RST
RST PULLED LOW BY MCU
IAB
32 CYCLES
32 CYCLES
VECTOR HIGH
CGMXCLK
ILLEGAL ADDRESS RST
ILLEGAL OPCODE RST
COPRST
LVI
POR
INTERNAL RESET
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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