MC68HC11F1CFN2 Freescale Semiconductor, MC68HC11F1CFN2 Datasheet - Page 88

• Manufacturer Part Number: MC68HC11F1CFN2
• Description: IC MCU 512 EEPROM 2MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC11F1CFN2

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 2MHz
• 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: -

7.3 Receive Operation
7-2
REQUESTS
TRANSMITTER
During receive operations, the transmit sequence is reversed. The serial shift register
receives data and transfers it to a parallel receive data register (SCDR) as a complete
word. This double buffered operation allows a character to be shifted in serially while
another character is already in the SCDR. An advanced data recovery scheme distin-
guishes valid data from noise in the serial data stream. The data input is selectively
sampled to detect receive data, and a majority voting circuit determines the value and
integrity of each bit.
BAUD RATE
SCI Rx
CLOCK
SCCR1 SCI CONTROL 1
SCI INTERRUPT
REQUEST
H (8) 7 6 5 4 3 2 1 0
10 (11) - BIT Tx SHIFT REGISTER
Figure 7-1 SCI Transmitter Block Diagram
Freescale Semiconductor, Inc.
SCDR Tx BUFFER
For More Information On This Product,
SERIAL COMMUNICATIONS INTERFACE
TDRE
TIE
TC
TCIE
CONTROL LOGIC
Go to: www.freescale.com
TRANSMITTER
SCSR INTERRUPT STATUS
L
(WRITE-ONLY)
SCCR2 SCI CONTROL 2
DIRECTION (OUT)
FORCE PIN
8
AND CONTROL
PIN BUFFER
8
DDD1
INTERNAL
DATA BUS
8
8
TECHNICAL DATA
MC68HC11F1
PD1/
TxD