ST72321J9-Auto STMicroelectronics, ST72321J9-Auto Datasheet - Page 7
ST72321J9-Auto
Manufacturer Part Number
ST72321J9-Auto
Description
8-bit MCU for automotive with 60 Kbyte Flash, 10-bit ADC, timers, SPI, SCI and I2C interfaces
Manufacturer
STMicroelectronics
Datasheet
1.ST72321R9-AUTO.pdf
(243 pages)
Specifications of ST72321J9-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
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ST72321xx-Auto
15
16
Serial communications interface (SCI) . . . . . . . . . . . . . . . . . . . . . . . . 135
15.1
15.2
15.3
15.4
15.5
15.6
15.7
I2C bus interface (I2C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
16.1
16.2
16.3
16.4
16.5
16.6
16.7
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
15.4.1
15.4.2
15.4.3
Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
SCI registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
15.7.1
15.7.2
15.7.3
15.7.4
15.7.5
15.7.6
15.7.7
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
16.2.1
16.2.2
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
16.3.1
16.3.2
16.3.3
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
16.4.1
16.4.2
Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
16.7.1
Serial data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Status register (SCISR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Control register 1 (SCICR1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Control register 2 (SCICR2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Data register (SCIDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Baud rate register (SCIBRR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Extended receive prescaler division register (SCIERPR) . . . . . . . . . . 152
Extended transmit prescaler division register (SCIETPR) . . . . . . . . . . 153
I2C master features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
I2C slave features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Communication flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
SDA/SCL line control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Slave mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Master mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
I2C control register (CR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Doc ID 13829 Rev 1
Contents
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