MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 114

• 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

7
CPOL – Clock polarity
This bit allows the user to select the polarity of the clocks to be sent to the SCLK pin. It works in
conjunction with the CPHA bit to produce the desired clock-data relation (see
Figure
This bit should not be manipulated while the transmitter is enabled.
CPHA – Clock phase
This bit allows the user to select the phase of the clocks to be sent to the SCLK pin. This bit works
in conjunction with the CPOL bit to produce the desired clock-data relation (see
Figure
This bit should not be manipulated while the transmitter is enabled.
(CPOL = 1, CPHA = 1)
(CPOL = 0, CPHA = 0)
(CPOL = 0, CPHA = 1)
(CPOL = 1, CPHA = 0)
7-10).
7-10).
1 (set)
0 (clear) –
1 (set)
0 (clear) –
clock
clock
clock
clock
data
Idle or preceding
transmission
–
–
Freescale Semiconductor, Inc.
Steady high value at SCLK pin outside transmission window.
Steady low value at SCLK pin outside transmission window.
SCLK clock line activated at beginning of data bit.
SCLK clock line activated in middle of data bit.
Figure 7-9 SCI data clock timing diagram (M=0)
For More Information On This Product,
Start
Start
SERIAL COMMUNICATIONS INTERFACE
LSB
0
Go to: www.freescale.com
1
2
M = 0 (8 data bits)
3
*
LBCL bit controls last data clock
4
5
6
MSB
*
*
7
*
*
Stop
Stop
MC68HC05X16
Figure 7-9
Figure 7-9
Idle or next
transmission
Rev. 1
and
and