mc68hc908gp32 Freescale Semiconductor, Inc, mc68hc908gp32 Datasheet - Page 154

• Manufacturer Part Number: mc68hc908gp32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface Module (SCI)
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 13-8
selected as SCI clock source.
154
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 = f
PD = prescaler divisor
BD = baud rate divisor
shows the SCI baud rates that can be generated with a 4.9152-MHz bus clock when f
Address:
Reset:
Read:
Write:
baud rate
$0019
BUS
Bit 7
0
SCR2, SCR1, and SCR0
SCP1 and SCP0
or CGMXCLK (selected by SCIBDSRC bit in CONFIG2 register)
=
Figure 13-16. SCI Baud Rate Register (SCBR)
SCI clock source
-------------------------------------------- -
= Unimplemented
64 PD
00
01
10
11
Table 13-6. SCI Baud Rate Prescaling
Table 13-7. SCI Baud Rate Selection
6
0
000
001
010
011
100
101
110
111
×
MC68HC908GP32 Data Sheet, Rev. 10
×
SCP1
BD
5
0
SCP0
4
0
Prescaler Divisor (PD)
Baud Rate Divisor (BD)
R
R
3
0
13
1
3
4
= Reserved
128
SCR2
16
32
64
1
2
4
8
2
0
Table
Table
13-7. Reset clears
SCR1
1
0
13-6. Reset clears SCP1
Freescale Semiconductor
SCR0
Bit 0
0
BUS
is