MC68HC05RC8 Datasheet, PDF (25/122 Pages) Freescale Semiconductor, Inc – General Release Specification

1.5.4 RESET
1.5.5 LPRST
1.5.6 IRO
1.5.7 PA0–PA7
1.5.8 PB0–PB7
Freescale Semiconductor, Inc.
General Description
Signal Description
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.
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.
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).
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.
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
General Description
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