MC68HC908GT16 Datasheet, PDF (258/412 Pages) Motorola, Inc – Microcontrollers

Enhanced Serial Communications Interface (ESCI)
INTERNAL BUS
÷4
PRE-
BAUD
SCALER DIVIDER
÷ 16
SCP1
SCP0
SCR1
SCR2
SCR0
TXINV
ESCI DATA REGISTER
11-BIT
TRANSMIT
SHIFT REGISTER
H8 7 6 5 4 3 2 1 0 L
PDS2
PDS1
PDS0
PSSB4
PSSB3
PSSB2
PSSB1
PSSB0
M
PEN
PARITY
PTY
GENERATION
T8
TRANSMITTER
CONTROL LOGIC
SCTE
SCTIE
TC
TCIE
SCTE
SCTIE
TC
TCIE
SBK
LOOPS
ENSCI
TE
LINT
Figure 18-4. ESCI Transmitter
SCI_TxD
To initiate an ESCI transmission:
1. Enable the ESCI by writing a logic 1 to the enable ESCI bit
(ENSCI) in ESCI control register 1 (SCC1).
2. Enable the transmitter by writing a logic 1 to the transmitter enable
bit (TE) in ESCI control register 2 (SCC2).
3. Clear the ESCI transmitter empty bit (SCTE) by first reading ESCI
status register 1 (SCS1) and then writing to the SCDR. For 9-bit
data, also write the T8 bit in SCC3.
4. Repeat step 3 for each subsequent transmission.
Technical Data
258
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
Enhanced Serial Communications Interface (ESCI) Module
MOTOROLA