mc68hc908kx8 Freescale Semiconductor, Inc, mc68hc908kx8 Datasheet - Page 134

• Manufacturer Part Number: mc68hc908kx8
• Description: M68hc08 Microcontrollers
• 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 12-8
134
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.
f
PD = prescaler divisor
BD = baud rate divisor
BAUDCLK
shows the SCI baud rates that can be generated with a 4.9152-MHz CGMXCLK frequency.
= baud clock frequency
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
Baud rate
SCR[2:1:0]
SCP[1:0]
000
001
010
011
100
101
110
111
00
01
10
11
Table 12-6. SCI Baud Rate Prescaling
Table 12-7. SCI Baud Rate Selection
=
----------------------------------- -
64
f BAUDCLK
×
PD BD
×
Baud Rate Divisor (BD)
Prescaler Divisor (PD)
128
13
16
32
64
1
3
4
1
2
4
8
Table
Table
12-7. Reset clears
12-6. Reset clears SCP1
Freescale Semiconductor