XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 280

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

Serial Communications Interface (SCI)
Technical Data
280
SCP1 and SCP0 — SCI Baud Rate Prescaler Bits
SCR2 – SCR0 — SCI Baud Rate Select Bits
Use the following formula to calculate the SCI baud rate:
where:
These read/write bits select the baud rate prescaler divisor as shown
in
These read/write bits select the SCI baud rate divisor as shown in
Table
f
PD = prescaler divisor
BD = baud rate divisor
Crystal
Table
SCP[1:0]
SCR[2:1:0]
Serial Communications Interface (SCI)
Baud rate
00
01
10
18-10. Reset clears SCR2–SCR0.
11
000
001
010
011
100
101
110
111
= crystal frequency
18-9. Reset clears SCP1 and SCP0.
Table 18-9. SCI Baud Rate Prescaling
Table 18-10. SCI Baud Rate Selection
=
----------------------------------- -
64 PD BD
×
f
Crystal
×
Prescaler Divisor (PD)
Baud Rate Divisor (BD)
13
MC68HC908AZ60A — Rev 2.0
128
1
3
4
16
32
64
1
2
4
8
MOTOROLA