mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 100
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mc68hc908jb8
Manufacturer Part Number
mc68hc908jb8
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908JB8.pdf
(286 pages)
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System Integration Module (SIM)
8.4.2.1 Power-On Reset
Technical Data
100
OSCXCLK
OSCOUT
PORRST
OSC1
RST
IAB
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 OSCXCLK cycles. Sixty-four OSCXCLK cycles later, the CPU and
memories are released from reset to allow the reset vector sequence to
occur.
At power-on, the following events occur:
CYCLES
•
•
•
•
•
•
4096
A POR pulse is generated.
The internal reset signal is asserted.
The SIM enables the oscillator to drive OSCXCLK.
Internal clocks to the CPU and modules are held inactive for 4096
OSCXCLK cycles to allow stabilization of the oscillator.
The RST pin is driven low during the oscillator stabilization time.
The POR bit of the reset status register (RSR) is set and all other
bits in the register are cleared.
Figure 8-7. POR Recovery
System Integration Module (SIM)
CYCLES
32
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
CYCLES
32
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