MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 117

• Manufacturer Part Number: MC68HC705X32CFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC705X32CFU

• Cpu Family: HC05
• Device Core Size: 8b
• Frequency (max): 4MHz
• Interface Type: SCI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 528Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

After loading the last byte in the serial communications data register and receiving the TDRE flag,
the user should clear TE. Transmission of the last byte will then be completed and the line will go
idle.
RE — Receiver enable
When RE is clear (receiver disabled) all the status bits associated with the receiver (RDRF, IDLE,
OR, NF and FE) are inhibited.
RWU — Receiver wake-up
When the receiver wake-up bit is set by the user software, it puts the receiver to sleep and enables
the wake-up function. The type of wake-up mode for the receiver is determined by the WAKE bit
discussed above (in the SCCR1). When the RWU bit is set, no status flags will be set. Flags which
were set previously will not be cleared when RWU is set.
If the WAKE bit is cleared, RWU is cleared by the SCI logic after receiving 10 (M = 0) or 11 (M =1)
consecutive ones. Under these conditions, RWU cannot be set if the line is idle. If the WAKE bit is
set, RWU is cleared after receiving an address bit. The RDRF flag will then be set and the address
byte stored in the receiver data register.
SBK — Send break
If the send break bit is toggled set and cleared, the transmitter sends 10 (M = 0) or 11 (M = 1) zeros
and then reverts to idle sending data. If SBK remains set, the transmitter will continually send
whole blocks of zeros (sets of 10 or 11) until cleared. At the completion of the break code, the
transmitter sends at least one high bit to guarantee recognition of a valid start bit.
MC68HC05X16
1 (set)
0 (clear) –
1 (set)
0 (clear) –
Freescale Semiconductor, Inc.
–
–
For More Information On This Product,
Transmitter enabled.
Transmitter disabled.
Receiver enabled.
Receiver disabled.
SERIAL COMMUNICATIONS INTERFACE
Go to: www.freescale.com
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