mc908jl16 Freescale Semiconductor, Inc, mc908jl16 Datasheet - Page 107

• Manufacturer Part Number: mc908jl16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

7.8.7 SCI Baud Rate Register
The baud rate register (SCBR) selects the baud rate for both the receiver and the transmitter.
SCP1 and SCP0 — SCI Baud Rate Prescaler Bits
SCR2–SCR0 — SCI Baud Rate Select Bits
Use this formula to calculate the SCI baud rate:
where:
Table 7-8
Freescale Semiconductor
These read/write bits select the baud rate prescaler divisor as shown in
and SCP0.
These read/write bits select the SCI baud rate divisor as shown in
SCR2–SCR0.
SCI clock source = bus clock
PD = prescaler divisor
BD = baud rate divisor
shows the SCI baud rates that can be generated with a 4.9152 MHz bus clock.
Address:
Reset:
Read:
Write:
$0019
Bit 7
0
0
SCR2, SCR1, and SCR0
Figure 7-16. SCI Baud Rate Register (SCBR)
SCP1 and SCP0
= Unimplemented
baud rate
Table 7-6. SCI Baud Rate Prescaling
Table 7-7. SCI Baud Rate Selection
6
0
0
000
001
010
011
100
101
110
111
00
01
10
11
MC68HC908JL16 Data Sheet, Rev. 1.1
SCP1
=
5
0
SCI clock source
-------------------------------------------- -
64
×
SCP0
PD BD
4
0
×
Baud Rate Divisor (BD)
Prescaler Divisor (PD)
R
R
3
0
= Reserved
128
SCR2
13
16
32
64
1
3
4
1
2
4
8
2
0
Table
Table
7-7. Reset clears
SCR1
1
0
7-6. Reset clears SCP1
SCR0
Bit 0
0
I/O Registers
107