XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 264
XC908AS60ACFU
Manufacturer Part Number
XC908AS60ACFU
Description
MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
Manufacturer
Motorola Semiconductor Products
Datasheet
1.XC908AS60ACFU.pdf
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Serial Communications Interface (SCI)
18.7 SCI During Break Module Interrupts
18.8 I/O Signals
Technical Data
264
SCI module does not bring the MCU out of Stop mode. SCI module
operation resumes after the MCU exits stop mode.
Because the internal clock is inactive during stop mode, entering stop
mode during an SCI transmission or reception results in invalid data.
The BCFE bit in the break flag control register (BFCR) enables software
to clear status bits during the break state. (See
page 203).
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:
•
•
PTE0/SCTxD — Transmit data
PTE1/SCRxD — Receive data
Serial Communications Interface (SCI)
MC68HC908AZ60A — Rev 2.0
Break Module (BRK)
MOTOROLA
on
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