ST7263BK1 STMicroelectronics, ST7263BK1 Datasheet - Page 113

• 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
Note:
Setting the START bit while the BUSY bit is cleared causes the interface to switch to Master
mode (M/SL bit set) and generates a Start condition.
Once the Start condition is sent, the EVF and SB bits are set by hardware with an interrupt if
the ITE bit is set.
Then the master waits for a read of the SR1 register followed by a write in the DR register
with the Slave address byte, holding the SCL line low (see
EV5).
Slave address transmission
Then the slave address byte is sent to the SDA line via the internal shift register.
After completion of this transfer (and acknowledge from the slave if the ACK bit is set), the
EVF bit is set by hardware with interrupt generation if the ITE bit is set.
Then the master waits for a read of the SR1 register followed by a write in the CR register
(for example set PE bit), holding the SCL line low (see
EV6).
Next the master must enter Receiver or Transmitter mode.
Master receiver
Following the address transmission and after the SR1 and CR registers have been
accessed, the master receives bytes from the SDA line into the DR register via the internal
shift register. After each byte the interface generates in sequence:
●
●
Then the interface waits for a read of the SR1 register followed by a read of the DR register,
holding the SCL line low (see
To close the communication: before reading the last byte from the DR register, set the STOP
bit to generate the Stop condition. The interface goes automatically back to slave mode
(M/SL bit cleared).
In order to generate the non-acknowledge pulse after the last received data byte, the ACK
bit must be cleared just before reading the second last data byte.
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 internal shift register.
The master waits for a read of the SR1 register followed by a write in the DR register,
holding the SCL line low (see
When the acknowledge bit is received, the interface sets, EVF and BTF bits with an interrupt
if the ITE bit is set.
To close the communication: after writing the last byte to the DR register, set the STOP bit to
generate the Stop condition. The interface goes automatically back to slave mode (M/SL bit
cleared).
Error cases
●
Acknowledge pulse if the ACK bit is set
EVF and BTF bits are set by hardware with an interrupt if the ITE bit is set.
BERR: Detection of a Stop or a Start condition during a byte transfer. In this case, the
EVF and BERR bits are set by hardware with an interrupt if ITE is set.
Note that BERR will not be set if an error is detected during the first or second pulse of
Doc ID 7516 Rev 8
Figure 48
Figure 48
Transfer sequencing EV7).
Transfer sequencing EV8).
Figure 48
Figure 48
Transfer sequencing
On-chip peripherals
Transfer sequencing
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