mc68hc08az60 Freescale Semiconductor, Inc, mc68hc08az60 Datasheet - Page 193

• Manufacturer Part Number: mc68hc08az60
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

SCI During Break Module Interrupts
I/ O Signals
PTE0/SCTxD
(Transmit Data)
PTE1/SCRxD
(Receive Data)
21-sci
MOTOROLA
The BCFE bit in the break flag control register (BFCR) enables software
to clear status bits during the break state. (See
135).
To allow software to clear status bits during a break interrupt, write a
logic 1 to the BCFE bit. If a status bit is cleared during the break state, it
remains cleared when the MCU exits the break state.
To protect status bits during the break state, write a logic 0 to the BCFE
bit. With BCFE at logic 0 (its default state), software can read and write
I/O registers during the break state without affecting status bits. Some
status bits have a two-step read/write clearing procedure. If software
does the first step on such a bit before the break, the bit cannot change
during the break state as long as BCFE is at logic 0. After the break,
doing the second step clears the status bit.
Port E shares two of its pins with the SCI module. The two SCI I/O pins
are:
The PTE0/SCTxD pin is the serial data output from the SCI transmitter.
The SCI shares the PTE0/SCTxD pin with port E. When the SCI is
enabled, the PTE0/SCTxD pin is an output regardless of the state of the
DDRE2 bit in data direction register E (DDRE).
The PTE1/SCRxD pin is the serial data input to the SCI receiver. The
SCI shares the PTE1/SCRxD pin with port E. When the SCI is enabled,
the PTE1/SCRxD pin is an input regardless of the state of the DDRE1
bit in data direction register E (DDRE).
Freescale Semiconductor, Inc.
•
•
Serial Communications Interface Module (SCI)
For More Information On This Product,
PTE0/SCTxD — Transmit data
PTE1/SCRxD — Receive data
Go to: www.freescale.com
Serial Communications Interface Module (SCI)
SCI During Break Module Interrupts
Break Module
MC68HC08AZ60 — Rev 1.0
on page
193