MC908AP32CFBE Freescale, MC908AP32CFBE Datasheet - Page 178
MC908AP32CFBE
Manufacturer Part Number
MC908AP32CFBE
Description
Manufacturer
Freescale
Datasheet
1.MC908AP32CFBE.pdf
(324 pages)
Specifications of MC908AP32CFBE
Cpu Family
HC08
Device Core Size
8b
Frequency (max)
8MHz
Interface Type
SCI/SPI
Total Internal Ram Size
2KB
# I/os (max)
32
Number Of Timers - General Purpose
4
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
PQFP
Program Memory Type
Flash
Program Memory Size
32KB
Lead Free Status / RoHS Status
Compliant
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Serial Communications Interface Module (SCI)
11.8.7 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:
178
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
(selected by SCIBDSRC bit in CONFIG2 register)
PD = prescaler divisor
BD = baud rate divisor
Address:
Reset:
Read:
Write:
$0019
BUS
0
0
SCR2, SCR1, and SCR0
SCP1 and SCP0
or CGMXCLK
Figure 11-16. SCI Baud Rate Register (SCBR)
= Unimplemented
00
01
10
11
Table 11-6. SCI Baud Rate Prescaling
baud rate
Table 11-7. SCI Baud Rate Selection
6
0
0
MC68HC908AP Family Data Sheet, Rev. 4
000
001
010
011
100
101
110
111
SCP1
=
5
0
SCI clock source
-------------------------------------------- -
64 PD BD
×
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
11-7. Reset clears
SCR1
1
0
11-6. Reset clears SCP1
Freescale Semiconductor
SCR0
Bit 0
0
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