ST7263BK1 STMicroelectronics, ST7263BK1 Datasheet - Page 111

• Manufacturer Part Number: ST7263BK1
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 32K FLASH/ROM, DFU CAPABILITY, 8-BIT ADC, WDG, TIMER, SCI and I2C
• Manufacturer: STMicroelectronics

Specifications of ST7263BK1

• 4, 8, 16 Or 32 Kbytes Program Memory: high density Flash (HDFlash), FastROM or ROM with Read-Out and Write protection

ST7263Bxx
11.5.4
When the I²C cell is disabled, the SDA and SCL ports revert to being standard I/O port pins.
Figure 47. I²C interface block diagram
Functional description
Refer to the CR, SR1 and SR2 registers in
By default the I²C interface operates in Slave mode (M/SL bit is cleared) except when it
initiates a transmit or receive sequence.
Slave mode
As soon as a start condition is detected, the address is received from the SDA line and sent
to the shift register; then it is compared with the address of the interface or the General Call
address (if selected by software).
●
●
Then the interface waits for a read of the SR1 register, holding the SCL line low (see
Figure 48
Next, software must read the DR register to determine from the least significant bit (Data
Direction Bit) if the slave must enter Receiver or Transmitter mode.
Slave receiver
SCL or SCLI
SDA or SDAI
Address not matched: the interface ignores it and waits for another Start condition.
Address matched
The interface generates in sequence:
–
–
Acknowledge pulse if the ACK bit is set.
EVF and ADSL bits are set with an interrupt if the ITE bit is set.
Transfer sequencing EV1).
CLOCK CONTROL
CLOCK CONTROL REGISTER (CCR)
DATA CONTROL
STATUS REGISTER 1 (SR1)
STATUS REGISTER 2 (SR2)
CONTROL REGISTER (CR)
Doc ID 7516 Rev 8
Section
OWN ADDRESS REGISTER (OAR)
DATA SHIFT REGISTER
DATA REGISTER (DR)
CONTROL LOGIC
11.5.7. for the bit definitions.
COMPARATOR
INTERRUPT
On-chip peripherals
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