MC68HC11F1VFN3 Freescale Semiconductor, MC68HC11F1VFN3 Datasheet - Page 42

• Manufacturer Part Number: MC68HC11F1VFN3
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC11F1VFN3

• Cpu Family: HC11
• Device Core Size: 8b
• Frequency (max): 3MHz
• Interface Type: SCI/SPI
• Program Memory Type: EEPROM
• Program Memory Size: 512Byte
• Total Internal Ram Size: 1KB
• Number Of Timers - General Purpose: 1
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 105C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 68
• Package Type: PLCC
• Lead Free Status / Rohs Status: Not Compliant

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