STM32W108HBU61TR STMicroelectronics, STM32W108HBU61TR Datasheet - Page 86

• Manufacturer Part Number: STM32W108HBU61TR
• Description: 16/32-BITS MICROS
• Manufacturer: STMicroelectronics
• Series: STM32r

Specifications of STM32W108HBU61TR

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Applications: IEEE 802.15.4 Wireless
• Processing Unit: Microprocessor
• Operating Supply Voltage (min): 1.18V
• Operating Supply Voltage (typ): 1.25V
• Operating Supply Voltage (max): 1.32V
• Package Type: VFQFPN EP
• Pin Count: 40
• Mounting: Surface Mount
• Rad Hardened: No
• Core Processor: ARM® Cortex-M3™
• Program Memory Type: FLASH (128 kB)
• Controller Series: STM32W
• Ram Size: 8K x 8
• Interface: I²C, SPI, UART/USART
• Number Of I /o: 18
• Voltage - Supply: 1.18 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 40-VFQFN Exposed Pad
• Lead Free Status / Rohs Status: Compliant

Serial interfaces
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receive frame segment is determined with the SC_TWIACK bit in the SCx_TWICTRL2
register.
Figure 11. I
Generation of a 7-bit address is accomplished with one transmit segment. The upper 7 bits
of the transmitted character contain the 7-bit address. The remaining lower bit contains the
command type ("read" or "write").
Generation of a 10-bit address is accomplished with two transmit segments. The upper 5
bits of the first transmit character must be set to 0x1E. The next 2 bits are for the 2 most
significant bits of the 10-bit address. The remaining lower bit contains the command type
("read" or "write"). The second transmit segment is for the remaining 8 bits of the 10-bit
address.
Transmitted and received characters are accessed through the SCx_DATA register.
To initiate (re)start and stop segments, set the SC_TWISTART or SC_TWISTOP bit in the
SCx_TWICTRL1 register, then wait until the bit is clear. Alternatively, the SC_TWICMDFIN
bit in the SCx_TWISTAT can be used for waiting.
To initiate a transmit segment, write the data to the SCx_DATA data register, then set the
SC_TWISEND bit in the SCx_TWICTRL1 register, and finally wait until the bit is clear.
Alternatively the SC_TWITXFIN bit in the SCx_TWISTAT register can be used for waiting.
To initiate a receive segment, set the SC_TWIRECV bit in the SCx_TWICTRL1 register, wait
until it is clear, and then read from the SCx_DATA register. Alternatively, the SC_TWIRXFIN
bit in the SCx_TWISTAT register can be used for waiting. Now the SC_TWIRXNAK bit in the
SCx_TWISTAT register indicates if a NACK or ACK was received from an I
2
C segment transitions
RECEIVE Segment
STM32W108HB, STM32W108CC, STM32W108CB and STM32W108CZ
STOP Segment
with NACK
Doc ID 16252 Rev 9
START Segment
IDLE
NO
TRANSMIT Segment
RECEIVE Segment
received ACK ?
with ACK
YES
2
C slave device.