MC68HC705MC4MP datasheet(54/180 Pages) FREESCALE

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Operating Modes

MC68HC705MC4 — Rev. 2.0

Operating Modes

The conditions required to enter each mode are shown in Table 6-1. The

mode of operation is determined by:

1. The voltages on the IRQ and PD7/TCAP2 pins on the rising edge

of the external RESET pin.

2. The subsequent rising edge of RESET after an internal reset pulls

the RESET pin low.

6.3 User Mode

The user mode allows the MCU to function as a self-contained

microcontroller, with maximum use of the pins for on-chip peripheral

functions. All address and data activity occurs within the MCU and are

not available externally. User mode is entered on the rising edge of

RESET if the IRQ pin is within the normal operating voltage range.

In the user mode, port A shares six of its eight input/output (I/O) lines

with the dual channel pulse-width modulator (PWM) subsystem. Port B

shares two of its four I/O lines with the serial communications interface

(SCI) subsystem. Port C shares all of its 8-bit I/O lines with the

analog-to-digital (A/D) subsystem. Port D shares its two port lines with

the 16-bit timer subsystem.

The pinout for user mode is shown in Figure 1-2 and Figure 1-3.

Table 6-1. Operating Mode Conditions after Reset

RESET Pin

IRQ/VPP

PD7/TCAP2

Mode

VSS to VDD

User

VPP

VDD

Bootloader

Freescale Semiconductor, Inc.

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