參數(shù)資料
型號: 68HC05M68HC
廠商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 35/130頁
文件大?。?/td> 1541K
代理商: 68HC05M68HC
MC68HC705P6A
Rev. 2.0
Advance Information
MOTOROLA
Operating Modes
35
Advance Information
MC68HC705P6A
Section 3. Operating Modes
3.1 Contents
3.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
3.3
User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
3.4
Bootloader Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
3.5
3.5.1
3.5.1.1
3.5.1.2
3.5.2
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
STOP Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Halt Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
WAIT Instruction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
3.6
COP Watchdog Timer Considerations . . . . . . . . . . . . . . . . . . .40
3.2 Introduction
The MC68HC705P6A has two modes of operation that affect the pinout
and architecture of the MCU: user mode and bootloader mode. The user
mode is normally used for the application and the bootloader mode is
used for programming the EPROM. The conditions required to enter
each mode are shown in
Table 3-1
. The mode of operation is
determined by the voltages on the IRQ/V
PP
and PD7/TCAP pins on the
rising edge of the external RESET pin.
Table 3-1. Operating Mode Conditions After Reset
RESET Pin
IRQ/V
PP
PD7/TCAP
Mode
V
SS
to V
DD
V
SS
to V
DD
Single chip
V
PP
V
DD
Bootloader
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