MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 123

• 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

Note:
7.13
When the MCU enters STOP mode, the baud rate generator driving the receiver and transmitter
is shut down. This stops all SCI activity. Both the receiver and the transmitter are unable to operate.
If the STOP instruction is executed during a transmitter transfer, that transfer is halted. When STOP
mode is exited as a result of an external interrupt, that particular transmission resumes.
If the receiver is receiving data when the STOP instruction is executed, received data sampling is
stopped (baud generator stops) and the rest of the data is lost.
Warning: For the above reasons, all SCI transactions should be in the idle state when the STOP
7.14
The SCI system is not affected by WAIT mode and continues normal operation. Any valid SCI
interrupt will wake-up the system. If required, the SCI system can be disabled prior to entering
WAIT mode by writing a zero to the transmitter and receiver enable bits in the serial communication
control register 2 at $000F. This action will result in a reduction of power consumption during WAIT
mode.
MC68HC05X16
The examples shown in
the part is operating in slow mode (see
For the receiver, the internal clock frequency is 16 times higher than the selected baud
rate.
instruction is executed.
Bit 2
Table 7-9 SCI transmit baud rate output for a given prescaler output
SCI during STOP mode
SCI during WAIT mode
0
0
0
0
1
1
1
1
Freescale Semiconductor, Inc.
SCT/SCR bits
Bit 1
For More Information On This Product,
0
0
1
1
0
0
1
1
SERIAL COMMUNICATIONS INTERFACE
Bit 0
0
1
0
1
0
1
0
1
Go to: www.freescale.com
Table
Divide
128
by
16
32
64
1
2
4
8
7-6,
131072
131072
65536
32768
16384
Representative highest prescaler baud rate output
8192
4096
2048
1024
Table
Section
7-7,
32768
32768
16384
8192
4096
2048
1024
512
256
Table 7-8
2.2.3).
38400
38400
19200
9600
4800
2400
1200
600
300
and
Table 7-9
19200
19200
9600
4800
2400
1200
600
300
150
do not apply when
9600
9600
4800
2400
1200
600
300
150
75
7-21
7