MC68HC908GT16 Datasheet, PDF (284/412 Pages) Motorola, Inc – Microcontrollers

Enhanced Serial Communications Interface (ESCI)
18.9.6 ESCI Data Register
The ESCI data register (SCDR) is the buffer between the internal data
bus and the receive and transmit shift registers. Reset has no effect on
data in the ESCI data register.
Address: $0018
Bit 7
6
5
4
3
2
1
Bit 0
Read: R7
R6
R5
R4
R3
R2
R1
R0
Write: T7
T6
T5
T4
T3
T2
T1
T0
Reset:
Unaffected by reset
Figure 18-15. ESCI Data Register (SCDR)
R7/T7:R0/T0 — Receive/Transmit Data Bits
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 ESCI data register.
NOTE: Do not use read-modify-write instructions on the ESCI data register.
18.9.7 ESCI Baud Rate Register
The ESCI baud rate register (SCBR) together with the ESCI prescaler
register selects the baud rate for both the receiver and the transmitter.
NOTE: There are two prescalers available to adjust the baud rate. One in the
ESCI baud rate register and one in the ESCI prescaler register.
Address: $0019
Bit 7
6
5
4
3
2
1
Read:
R
LINR SCP1 SCP0
R
SCR2 SCR1
Write:
Reset: 0
0
0
0
0
0
0
= Unimplemented
R = Reserved
Figure 18-16. ESCI Baud Rate Register (SCBR)
Bit 0
SCR0
0
Technical Data
284
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
Enhanced Serial Communications Interface (ESCI) Module
MOTOROLA