MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 244
MC68HC08AZ60ACFU
Manufacturer Part Number
MC68HC08AZ60ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
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Serial Communications Interface (SCI)
16.9.6 SCI Data Register
Advance Information
244
NOTE:
Address:
RPF — Reception in Progress Flag Bit
The SCI data register is the buffer between the internal data bus and the
receive and transmit shift registers. Reset has no effect on data in the
SCI data register.
R7/T7:R0/T0 — Receive/Transmit Data Bits
Do not use read-modify-write instructions on the SCI data register.
Reset:
Read:
Write:
This read-only bit is set when the receiver detects a logic 0 during the
RT1 time period of the start bit search. RPF does not generate an
interrupt request. RPF is reset after the receiver detects false start bits
(usually from noise or a baud rate mismatch), or when the receiver
detects an idle character. Polling RPF before disabling the SCI
module or entering stop mode can show whether a reception is in
progress.
Reading address $0018 accesses the read-only received data bits,
R7:R0. Writing to address $0018 writes the data to be transmitted,
T7:T0. Reset has no effect on the SCI data register.
1 = Reception in progress
0 = No reception in progress
Serial Communications Interface (SCI)
$0018
Bit 7
R7
T7
Figure 16-17. SCI Data Register (SCDR)
R6
T6
6
R5
T5
5
Unaffected by Reset
R4
T4
4
R3
T3
3
MC68HC08AZ60A — Rev 0.0
R2
T2
2
R1
T1
1
MOTOROLA
Bit 0
R0
T0
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