MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 81

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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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6.10
The SCI transmitter allows the user to control a one way synchronous serial transmission. The
SCLK pin is the clock output of the SCI transmitter. No clocks are sent to that pin during start bit
and stop bit. Depending on the state of the LBCL bit (bit 0 of SCCR1), clocks will or will not be
activated during the last valid data bit (address mark). The CPOL bit (bit 2 of SCCR1) allows the
user to select the clock polarity, and the CPHA bit (bit 1 of SCCR1) allows the user to select the
phase of the external clock (see
During idle, preamble and send break, the external SCLK clock is not activated.
These options allow the user to serially control peripherals which consist of shift registers, without
losing any functions of the SCI transmitter which can still talk to other SCI receivers. These options
do not affect the SCI receiver which is independent of the transmitter.
The SCLK pin works in conjunction with the TDO pin. When the SCI transmitter is disabled
(TE = 0), the SCLK and TDO pins go to the high impedance state.
Note:
MC68HC05B6
Rev. 4.1
The LBCL, CPOL and CPHA bits have to be selected before enabling the transmitter
to ensure that the clocks function correctly. These bits should not be changed while the
transmitter is enabled.
Figure 6-8 SCI example of synchronous and asynchronous transmission
SCI synchronous transmission
MC68HC05B6
Output port
SERIAL COMMUNICATIONS INTERFACE
SCLK
TDO
RDI
Figure
6-8,
Figure 6-9
Data out
Data in
Data in
Clock
Enable
and
Figure
display driver, etc.)
6-10).
(e.g. shift register,
Asynchronous
(e.g. Modem)
Synchronous
Freescale
6-9
6

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