MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 90

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MC68HC705B16CFN

Manufacturer Part Number
MC68HC705B16CFN
Description
IC MCU 2.1MHZ 15K OTP 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC05r
Datasheet

Specifications of MC68HC705B16CFN

Core Processor
HC05
Core Size
8-Bit
Speed
2.1MHz
Connectivity
SCI
Peripherals
POR, WDT
Number Of I /o
32
Program Memory Size
15KB (15K x 8)
Program Memory Type
OTP
Eeprom Size
256 x 8
Ram Size
352 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
52-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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6
6.11.5
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
Freescale
6-18
SCI baud rate (BAUD)
Baud rate register (BAUD)
Table
Table 6-4 Second prescaler stage (transmitter)
SERIAL COMMUNICATIONS INTERFACE
SCT2
0
0
0
0
1
1
1
1
Address
6-4.
$000D
Table 6-3 First prescaler stage
SCP1
0
0
1
1
SCP1
SCT1
bit 7
0
0
1
1
0
0
1
1
SCP0
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
1
2
4
8
bit 3
SCR2 SCR1 SCR0 00uu uuuu
bit 2
bit 1
MC68HC05B6
bit 0
Rev. 4.1
on reset
State

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