General Description

Signal Description

1.5.4 RESET

This active-low pin is used to reset the MCU to a known startup state by pulling RESET low. The RESET pin contains an internal Schmitt trigger as part of its input to improve noise immunity. See Section 5. Resets.

1.5.5 LPRST

The LPRST pin is an active-low pin and is used to put the MCU into low-power reset mode. In low-power reset mode the MCU is held in reset with all processor clocks halted. See Section 5. Resets.

1.5.6 IRO

The IRO pin is the high-current source and sink output of the carrier modulator transmitter subsystem which is suitable for driving infrared (IR) LED biasing logic. See Section 9. Carrier Modulator Transmitter (CMT).

1.5.7 PA0–PA7

These eight I/O lines comprise port A. The state of any pin is software programmable and all port A lines are configured as inputs during power-on or reset. For detailed information on I/O programming, see 2.4 Input/Output Programming.

1.5.8 PB0–PB7

These eight I/O lines comprise port B. The state of any pin is software programmable and all port B lines are configured as inputs during power-on or reset. Each port B I/O line has a mask optionable pullup/interrupt for keyscan. For detailed information on I/O programming, see 2.4 Input/Output Programming.

MC68HC05RC16 — Rev. 3.0

 

General Release Specification

 

 

 

MOTOROLA

General Description

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