ST72321AR6-Auto STMicroelectronics, ST72321AR6-Auto Datasheet - Page 164

• 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

I2C bus interface (I2C)
16.7
16.7.1
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Register description
I
Table 83.
CR
2
Bit
7:6
C control register (CR)
5
4
3
2
7
START
ENGC
Name
Reserved
ACK
PE
-
-
CR register description
Reserved. Forced to 0 by hardware.
Peripheral enable
Enable General Call
Generation of a Start condition
Acknowledge enable
This bit is set and cleared by software.
0: Peripheral disabled
1: Master/Slave capability
Notes:
- When PE = 0, all the bits of the CR register and the SR register except the Stop
bit are reset. All outputs are released while PE = 0
- When PE = 1, the corresponding I/O pins are selected by hardware as alternate
functions.
To enable the I
write only activates the interface (only PE is set).
This bit is set and cleared by software. It is also cleared by hardware when the
interface is disabled (PE = 0). The 00h General Call address is acknowledged (01h
ignored).
0: General Call disabled
1: General Call enabled
Note: In accordance with the I2C standard, when GCAL addressing is enabled, an
I2C slave can only receive data. It will not transmit data to the master.
This bit is set and cleared by software. It is also cleared by hardware when the
interface is disabled (PE = 0) or when the Start condition is sent (with interrupt
generation if ITE = 1).
In Master mode
0: No start generation
1: Repeated start generation
In Slave mode
0: No start generation
1: Start generation when the bus is free
This bit is set and cleared by software. It is also cleared by hardware when the
interface is disabled (PE = 0).
0: No acknowledge returned
1: Acknowledge returned after an address byte or a data byte is received
6
RW
PE
5
2
Doc ID 13829 Rev 1
C interface, write the CR register TWICE with PE = 1 as the first
ENGC
RW
4
START
Function
RW
3
ACK
RW
2
Reset value: 0000 0000 (00h)
STOP
RW
1
ST72321xx-Auto
RW
ITE
0