MC68HC08AZ16 Datasheet, PDF (206/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Serial Communications Interface Module (SCI)
I/O registers
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 SCI data register.
SCI baud rate
register (SCBR)
The baud rate register selects the baud rate for both the receiver and the
transmitter.
SCBR
$0019
Read:
Write:
Reset:
Bit 7
6
5
4
3
2
SCP1 SCP0
SCR2
0
0
0
0
0
0
= Unimplemented
Figure 12. SCI Baud Rate Register (SCBR)
1
SCR1
0
Bit 0
SCR0
0
SCP1 and SCP0 — SCI Baud Rate Prescaler Bits
These read/write bits select the baud rate prescaler divisor as shown
in Table 8. Reset clears SCP1 and SCP0.
Table 8. SCI baud rate prescaling
SCP1:0
00
01
10
11
Prescaler Divisor (PD)
1
3
4
13
SCR2–SCR0 — SCI baud rate select bits
These read/write bits select the SCI baud rate divisor as shown in
Table 9. Reset clears SCR2–SCR0.
37-sci
MOTOROLA
Serial Communications Interface Module (SCI)
MC68HC08AZ32
205