參數(shù)資料
型號(hào)： 68HC05PL4B
廠商： Motorola, Inc.
英文描述： 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述： 8位微控制器單元（MCU）。（8位微控制器）
文件頁(yè)數(shù)： 37/98頁(yè)
文件大?。?/td> 1019K
代理商： 68HC05PL4B
April 30, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05PL4
REV 2.0
RESETS
MOTOROLA
5-5
5.4
RESET STATES OF SUBSYSTEM IN MCU
The following paragraphs describe how a reset initializes various sub-systems.
5.4.1 CPU
A reset has the following effects on the CPU:
Loads the stack pointer with $FF.
Sets the I bit in the condition code register, inhibiting interrupts.
Loads the program counter with the user defined reset vector from
locations $1FFE and $1FFF.
Clears the stop latch, enabling the CPU clock.
Clears the wait latch, bringing the CPU out of the wait mode.
5.4.2 I/O Registers
A reset has the following effects on I/O registers:
Clears bits in data direction registers configuring pins as inputs:
– DDRA6–DDRA0 in DDRA for port A.
– DDRB7–DDRB0 in DDRB for port B.
– DDRC7–DDRC0 in DDRC for port C.
Has no effect on port A, B, C data registers.
5.4.3 8-Bit Timer
A reset has the following effects on the 8-Bit Timer:
Timer 8 system disabled (T8EN bit cleared)
Timer 8 interrupt request disabled
Timer 8 Pre-scalar preset to divide the internal bus clock by ratio 16
Timer 8 Counter register preset to $FF
Therefore disables the timer 8 interrupt and preset the counter for POR cycle
delay.
5.4.4 16-Bit Programmable Timer
A reset has the following effects on the 16-bit programmable Timer:
Initializes the timer counter registers (TMRH, TMRL) to a value of
$FFFC.
Initializes the alternate timer counter registers (ACRH, ACRL) to a value
of $FFFC.
Clears all the interrupt enables and the output level bit (OLVL) in the
timer control register (TCR).
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