MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 91

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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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SCR2, SCR1, SCR0 — SCI rate select bits (receiver)
These three read/write bits select the baud rates for the receiver. The prescaler output described
above is divided by the factors shown in
The following equations are used to calculate the receiver and transmitter baud rates:
where:
6.12
The flexibility of the baud rate generator allows many different baud rates to be selected. A
particular baud rate may be generated in several ways by manipulating the various prescaler and
division ratio bits.
frequencies. These are effectively the highest baud rates which can be achieved using a given
crystal.
MC68HC05B6
Rev. 4.1
NP = prescaler divide ratio
NT = transmitter baud rate divide ratio
NR = receiver baud rate divide ratio
baudTx = transmitter baud rate
baudRx = receiver baud rate
f
OSC
= oscillator frequency
Baud rate selection
Table 6-6
Table 6-5 Second prescaler stage (receiver)
SERIAL COMMUNICATIONS INTERFACE
SCR2
shows the baud rates that can be achieved, for five typical crystal
0
0
0
0
1
1
1
1
baudRx
baudTx
SCR1
0
0
1
1
0
0
1
1
Table
=
=
6-5.
SCR0
---------------------------------- -
16 NP NT
-----------------------------------
16 NP NR
0
1
0
1
0
1
0
1
f
f
op
op
division ratio (NR)
Receiver
128
16
32
64
1
2
4
8
Freescale
6-19
6

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