ST72321AR6-Auto STMicroelectronics, ST72321AR6-Auto Datasheet - Page 138

• Manufacturer Part Number: ST72321AR6-Auto
• Description: 8-bit MCU for automotive with 32 Kbyte Flash, 10-bit ADC, timers, SPI, SCI and I2C interfaces
• Manufacturer: STMicroelectronics

Specifications of ST72321AR6-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

Serial communications interface (SCI)
15.4
15.4.1
Figure 63. Word length programming
138/243
Functional description
The block diagram of the Serial Control Interface, is shown in
dedicated registers:
●
●
●
●
●
Refer to the register descriptions in
Serial data format
Word length may be selected as being either 8 or 9 bits by programming the M bit in the
SCICR1 register (see
The TDO pin is in low state during the start bit.
The TDO pin is in high state during the stop bit.
An Idle character is interpreted as an entire frame of ‘1’s followed by the start bit of the next
frame which contains data.
A Break character is interpreted on receiving ‘0’s for some multiple of the frame period. At
the end of the last break frame the transmitter inserts an extra ‘1’ bit to acknowledge the
start bit.
Transmission and reception are driven by their own baud rate generator.
9-bit Word length (M bit is set)
Start
Bit
8-bit Word length (M bit is reset)
Start
Bit
2 control registers (SCICR1 and SCICR2)
a status register (SCISR)
a baud rate register (SCIBRR)
an extended prescaler receiver register (SCIERPR)
an extended prescaler transmitter register (SCIETPR)
Bit0
Bit0
Bit1
Bit1
Data Frame
Idle Frame
Break Frame
Data Frame
Idle Frame
Break Frame
Bit2
Bit2
Figure
Bit3
Bit3
62).
Doc ID 13829 Rev 1
Bit4
Bit4
Section 15.7
Bit5
Bit5
Bit6
Bit6
for the definitions of each bit.
Possible
Bit7
Parity
Bit7
Bit
Possible
Parity
Bit8
Bit
Stop
Bit
Stop
Bit
Figure
Extra
Start
Next
Start
Bit
Bit
‘1’
Extra
Next Data Frame
Next
Start
Start
Bit
Bit
‘1’
Start
62. It contains six
Bit
Next Data Frame
Start
Bit
ST72321xx-Auto