MC68HC705P6A Datasheet, PDF (35/130 Pages) Motorola, Inc – HCMOS Microcontroller Unit

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 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.5.1 STOP Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
3.5.1.1 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.5.1.2 Halt Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3.5.2 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
MC68HC705P6A — Rev. 2.0
MOTOROLA
Operating Modes
Advance Information
35