mc68hc908gt8 Freescale Semiconductor, Inc, mc68hc908gt8 Datasheet - Page 153

• Manufacturer Part Number: mc68hc908gt8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

14.4.2 Transmitter
Figure 14-5
14.4.2.1 Character Length
The transmitter can accommodate either 8-bit or 9-bit data. The state of the M bit in ESCI control
register 1 (SCC1) determines character length. When transmitting 9-bit data, bit T8 in ESCI control
register 3 (SCC3) is the ninth bit (bit 8).
14.4.2.2 Character Transmission
During an ESCI transmission, the transmit shift register shifts a character out to the TxD pin. The ESCI
data register (SCDR) is the write-only buffer between the internal data bus and the transmit shift register.
Freescale Semiconductor
PSSB4
PSSB3
PSSB2
PSSB1
PSSB0
PDS2
PDS1
PDS0
shows the structure of the SCI transmitter and the registers are summarized in
SCP1
SCP0
SCR1
SCR2
SCR0
÷
4
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
SCALER
PRE-
DIVIDER
BAUD
PEN
PTY
TXINV
Figure 14-5. ESCI Transmitter
÷
GENERATION
16
PARITY
SCTE
SCTIE
TC
TCIE
T8
M
H
8
SCTIE
7
SCTE
TCIE
TC
ESCI DATA REGISTER
6
SHIFT REGISTER
INTERNAL BUS
TRANSMIT
5
11-BIT
4
CONTROL LOGIC
TRANSMITTER
3
2
1
LOOPS
ENSCI
LINT
SBK
TE
0
L
Functional Description
Figure
SCI_TxD
14-4.
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