XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 275
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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MC68HC908AZ60A — Rev 2.0
MOTOROLA
TC — Transmission Complete Bit
SCRF — SCI Receiver Full Bit
IDLE — Receiver Idle Bit
OR — Receiver Overrun Bit
This read-only bit is set when the SCTE bit is set, and no data,
preamble, or break character is being transmitted. TC generates an
SCI transmitter CPU interrupt request if the TCIE bit in SCC2 is also
set. TC is cleared automatically when data, preamble, or break is
queued and ready to be sent. There may be up to 1.5 transmitter
clocks of latency between queueing data, preamble, and break and
the transmission actually starting. Reset sets the TC bit.
This clearable, read-only bit is set when the data in the receive shift
register transfers to the SCI data register. SCRF can generate an SCI
receiver CPU interrupt request. When the SCRIE bit in SCC2 is set
the SCRF generates a CPU interrupt request. In normal operation,
clear the SCRF bit by reading SCS1 with SCRF set and then reading
the SCDR. Reset clears SCRF.
This clearable, read-only bit is set when 10 or 11 consecutive logic 1s
appear on the receiver input. IDLE generates an SCI error CPU
interrupt request if the ILIE bit in SCC2 is also set. Clear the IDLE bit
by reading SCS1 with IDLE set and then reading the SCDR. After the
receiver is enabled, it must receive a valid character that sets the
SCRF bit before an idle condition can set the IDLE bit. Also, after the
IDLE bit has been cleared, a valid character must again set the SCRF
bit before an idle condition can set the IDLE bit. Reset clears the IDLE
bit.
This clearable, read-only bit is set when software fails to read the
SCDR before the receive shift register receives the next character.
The OR bit generates an SCI error CPU interrupt request if the ORIE
1 = No transmission in progress
0 = Transmission in progress
1 = Received data available in SCDR
0 = Data not available in SCDR
1 = Receiver input idle
0 = Receiver input active (or idle since the IDLE bit was cleared)
Serial Communications Interface (SCI)
Serial Communications Interface (SCI)
Technical Data
I/O Registers
275
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