ST72521 STMICROELECTRONICS [STMicroelectronics], ST72521 Datasheet - Page 118

• Manufacturer Part Number: ST72521
• Description: 8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST72521
I
Master Transmitter
Following the address transmission and after SR1
register has been read, the master sends bytes
from the DR register to the SDA line via the inter-
nal shift register.
The master waits for a read of the SR1 register fol-
lowed by a write in the DR register, holding the
SCL line low (see
EV8).
When the acknowledge bit is received, the
interface sets:
– EVF and BTF bits with an interrupt if the ITE bit
To close the communication: after writing the last
byte to the DR register, set the STOP bit to gener-
ate the Stop condition. The interface goes auto-
matically back to slave mode (M/SL bit cleared).
Error Cases
– BERR: Detection of a Stop or a Start condition
118/211
2
C BUS INTERFACE (Cont’d)
is set.
during a byte transfer. In this case, the EVF and
Figure 65
Transfer sequencing
– AF: Detection of a non-acknowledge bit. In this
– ARLO: Detection of an arbitration lost condition.
Note: In all these cases, the SCL line is not held
low; however, the SDA line can remain low due to
possible «0» bits transmitted last. It is then neces-
sary to release both lines by software.
BERR bits are set by hardware with an interrupt
if ITE is set.
case, the EVF and AF bits are set by hardware
with an interrupt if the ITE bit is set. To resume,
set the START or STOP bit.
In this case the ARLO bit is set by hardware (with
an interrupt if the ITE bit is set and the interface
goes automatically back to slave mode (the M/SL
bit is cleared).