MC68HCP11 Datasheet, PDF (26/45 Pages) Motorola, Inc – 8-Bit Microcontroller

EXTAL
XTAL
OSCILLATOR
AND
CLOCK GENERATOR
(÷4)
E
AS
INTERNAL BUS CLOCK (PH2)
÷3
÷4
÷13
SCP[1:0]
0:0
0:1
1:0
1:1
SCR[2:0]
0:0:0
÷2
0:0:1
÷2
0:1:0
÷2
0:1:1
÷2
1:0:0
÷2
1:0:1
÷2
1:1:0
÷16
SCI
TRANSMIT
BAUD RATE
(1X)
÷2
1:1:1
SCI
RECEIVE
BAUD RATE
(16X)
Figure 8 SCI Baud Rate Diagram
SCI BAUD GENERATOR
SCCR1 — SCI Control Register 1
Bit 7
6
5
R8
T8
0
RESET: U
U
0
4
3
2
M
WAKE
0
0
0
0
R8 — Receive Data Bit 8
If M bit is set, R8 stores ninth bit in receive data character.
T8 — Transmit Data Bit 8
If M bit is set, T8 stores ninth bit in transmit data character.
M — Mode (Select Character Format)
0 = Start bit, 8 data bits, 1 stop bit
1 = Start bit, 9 data bits, 1 stop bit
$102C
1
Bit 0
0
0
0
0
MOTOROLA
26
MC68HC11A8
MC68HC11A8TS/D