ST6280 STMICROELECTRONICS [STMicroelectronics], ST6280 Datasheet - Page 37

• Manufacturer Part Number: ST6280
• Description: 8-BIT OTP/EPROM MCU WITH LCD DRIVER EEPROM AND A/D CONVERTER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

I/O PORTS (Cont’d)
4.1.3 ARTimer alternate functions
When bit PWMOE of register ARMC is low, pin
ARTIMout/PB7 is configured as any standard pin
of port B through the port registers. When PW-
MOE is high, ARTIMout/PB7 is the PWM output,
independently of the port registers configuration.
ARTIMin/PB6 is connected to the AR Timer input.
It is configured through the port registers as any
standard pin of port B. To use ARTIMin/PB6 as AR
Timer input, it must be configured as input through
DDRB.
4.1.4 SPI alternate functions
PA6/Sin and PA5/Scl pins must be configured as
input through the DDR and OR registers to be
used as data in and data clock (Slave mode) for
the SPI. All input modes are available and I/O's
can be read independently of the SPI at any time.
PA7/Sout must be configured in open drain output
mode to be used as data out for the SPI. In output
mode, the value present on the pin is the port data
register content only if PA7 is defined as push pull
output, while serial transmission is possible only in
open drain mode.
4.1.5 UART alternate functions
PB1/RXD1 pin must be configured as input
through the DDR and OR registers to be used as
reception line for the UART. All input modes are
available and PB1 can be read independently of
the UART at any time.
PB0/TXD1 pin must be configured as output
through the DDR and OR registers to be used as
transmission line for the UART. Value present on
the pin in output mode is the Data register content
as long as no transmission is active.
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