MC68HC11F1CFN4 Freescale Semiconductor, MC68HC11F1CFN4 Datasheet - Page 42

• Manufacturer Part Number: MC68HC11F1CFN4
• Description: IC MCU 512 EEPROM 4MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC11F1CFN4

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 30
• Program Memory Type: ROMless
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.75 V ~ 5.25 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Program Memory Size: -

9 Serial Communications Interface (SCI)
9.1 SCI Block Diagrams
42
TRANSMITTER
BAUD RATE
QUESTS
SCI Rx
CLOCK
The SCI, a universal asynchronous receiver transmitter (UART) serial communications interface, is one
of two independent serial I/O subsystems in the MC68HC11F1 and MC68HC11FC0. The SCI has a
standard non-return to zero (NRZ) format (one start bit, eight or nine data bits, and one stop bit) and
several selectable baud rates. The transmitter and receiver are independent but use the same data for-
mat and bit rate.
SCCR1
SCI INTERRUPT
REQUEST
SCI CONTROL 1
H
(8) 7
10 (11) - BIT Tx SHIFT REGISTER
SCDR Tx BUFFER
6
Freescale Semiconductor, Inc.
5
For More Information On This Product,
Figure 9 SCI Transmitter Block Diagram
4
TDRE
TIE
TC
TCIE
3
CONTROL LOGIC
TRANSMITTER
2
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SCSR1
1
0
L
SCI STATUS 1
(WRITE ONLY)
SCCR2
DIRECTION (OUT)
FORCE PIN
SCI CONTROL 2
AND CONTROL
PIN BUFFER
DDD1
INTERNAL
DATA BUS
MC68HC11F1/FC0
MC68HC11FTS/D
PD1
TxD