MC68HC08AZ60 Datasheet, PDF (179/452 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Serial Communications Interface Module (SCI)
Functional Description
The SCI transmitter empty bit, SCTE, in SCS1 becomes set when the
SCDR transfers a byte to the transmit shift register. The SCTE bit
indicates that the SCDR can accept new data from the internal data bus.
If the SCI transmit interrupt enable bit, SCTIE, in SCC2 is also set, the
SCTE bit generates a transmitter CPU interrupt request.
When the transmit shift register is not transmitting a character, the TxD
pin goes to the idle condition, logic 1. If at any time software clears the
ENSCI bit in SCI control register 1 (SCC1), the transmitter and receiver
relinquish control of the port E pins.
INTERNAL BUS
÷4
PRE-
BAUD
SCALER DIVIDER
÷ 16
SCI DATA REGISTER
SCP1
SCP0
SCR1
SCR2
SCR0
11-BIT
TRANSMIT
SHIFT REGISTER
H876543210L
TxD
TXINV
M
PEN
PARITY
PTY
GENERATION
T8
TRANSMITTER
CONTROL LOGIC
SCTE
SCTIE
TC
TCIE
SCTE
SCTIE
TC
TCIE
Figure 4. SCI Transmitter
SBK
LOOPS
ENSCI
TE
7-sci
MOTOROLA
MC68HC08AZ60 — Rev 1.0
Serial Communications Interface Module (SCI)
179
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