ST72C254G2M6 STMicroelectronics, ST72C254G2M6 Datasheet - Page 83

• Manufacturer Part Number: ST72C254G2M6
• Description: IC MCU 8BIT 8K FLASH SOIC-28
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72C254G2M6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 3.2 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Controller Family/series: ST7
• No. Of I/o's: 22
• Ram Memory Size: 256Byte
• Cpu Speed: 8MHz
• No. Of Timers: 2
• Rohs Compliant: Yes
• Processor Series: ST72C2x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 22
• Number Of Timers: 3 bit
• Operating Supply Voltage: 3.2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST7MDT1-DVP2/US
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: In Transition

I
I
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7 = FM/SM Fast/Standard I
This bit is set and cleared by software. It is not
cleared when the interface is disabled (PE=0).
0: Standard I
1: Fast I
Bit 6:0 = CC6-CC0 7-bit clock divider.
These bits select the speed of the bus (F
pending on the I
when the interface is disabled (PE=0).
– Standard mode (FM/SM=0): F
– Fast mode (FM/SM=1): F
Note: The programmed F
SCL and SDA lines.
FM/SM
2
2
C BUS INTERFACE (Cont’d)
C CLOCK CONTROL REGISTER (CCR)
7
F
F
CC6
SCL
SCL
2
C mode
= F
= F
2
CC5
C mode
CPU
CPU
2
C mode. They are not cleared
/(2x([CC6..CC0]+2))
/(3x([CC6..CC0]+2))
CC4
SCL
CC3
SCL
assumes no load on
2
C mode.
> 100kHz
SCL
CC2
<= 100kHz
CC1
SCL
CC0
) de-
0
ST72104G, ST72215G, ST72216G, ST72254G
I
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = D7-D0 8-bit Data Register.
These bits contain the byte to be received or trans-
mitted on the bus.
– Transmitter mode: Byte transmission start auto-
– Receiver mode: the first data byte is received au-
2
C DATA REGISTER (DR)
matically when the software writes in the DR reg-
ister.
tomatically in the DR register using the least sig-
nificant bit of the address.
Then, the following data bytes are received one
by one after reading the DR register.
D7
7
D6
D5
D4
D3
D2
D1
83/140
D0
0