MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 120

• Manufacturer Part Number: MC68HC705X32CFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC705X32CFU

• Cpu Family: HC05
• Device Core Size: 8b
• Frequency (max): 4MHz
• Interface Type: SCI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 528Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

7
7.11.5
The baud rate register provides the means to select two different or equivalent baud rates for the
transmitter and receiver.
SCP1, SCP0 — Serial prescaler select bits
These read/write bits determine the prescale factor, NP, by which the internal processor clock is
divided before it is applied to the transmitter and receiver rate control dividers, NT and NR. This
common prescaled output is used as the input to a divider that is controlled by the SCR0–SCR2
bits for the SCI receiver, and by the SCT0–SCT2 bits for the transmitter.
SCT2, SCT1, SCT0 — SCI rate select bits (transmitter)
These three read/write bits select the baud rates for the transmitter. The prescaler output is divided
by the factors shown in
SCI baud rate (BAUD)
Baud rate register (BAUD)
Freescale Semiconductor, Inc.
Table
Table 7-4 Second prescaler stage (transmitter)
For More Information On This Product,
SERIAL COMMUNICATIONS INTERFACE
SCT2
0
0
0
0
1
1
1
1
Address
$000D
7-4.
Table 7-3 First prescaler stage
SCP1
Go to: www.freescale.com
0
0
1
1
SCP1 SCP0
SCT1
bit 7
0
0
1
1
0
0
1
1
SCP0
0
1
0
1
bit 6
SCT0
0
1
0
1
0
1
0
1
SCT2
bit 5
division ratio (NP)
Prescaler
division ratio (NT)
SCT1
bit 4
13
1
3
4
Transmitter
128
16
32
64
SCT0 SCR2 SCR1 SCR0 00uu uuuu
1
2
4
8
bit 3
bit 2
bit 1
MC68HC05X16
bit 0
on reset
State
Rev. 1