MC68HC908JK8CP Freescale Semiconductor, MC68HC908JK8CP Datasheet - Page 143

• Manufacturer Part Number: MC68HC908JK8CP
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908JK8CP

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI
• Program Memory Type: Flash
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 15
• 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: 13-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 20
• Package Type: PDIP
• Lead Free Status / Rohs Status: Not Compliant

9.8.7 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 9-8
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 4.9152MHz bus clock.
Address:
Reset:
Read:
Write:
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
$0019
Bit 7
0
0
SCR2, SCR1, and SCR0
SCP1 and SCP0
Figure 9-16. SCI Baud Rate Register (SCBR)
= Unimplemented
baud rate
00
01
10
11
Table 9-6. SCI Baud Rate Prescaling
Table 9-7. SCI Baud Rate Selection
6
0
0
000
001
010
011
100
101
110
111
SCP1
=
5
0
SCI clock source
-------------------------------------------- -
64
×
SCP0
PD BD
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
9-7. Reset clears
SCR1
1
0
9-6. Reset clears SCP1
SCR0
Bit 0
0
I/O Registers
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