psd835g2 STMicroelectronics, psd835g2 Datasheet - Page 82

• Manufacturer Part Number: psd835g2
• Description: Configurable Memory System On A Chip For 8-bit Microcontrollers
• Manufacturer: STMicroelectronics

I/O ports
17.14
17.15
17.16
82/120
Table 20.
Table 21.
1. NA = Not Applicable.
Port Data registers
The port Data registers, shown in
data from the ports.
and MCU access for each register type. The registers are described below.
Data In
Port pins are connected directly to the Data In buffer. In MCU I/O input mode, the pin input is
read through the Data In buffer.
Data Out register
Stores output data written by the MCU in the MCU I/O output mode. The contents of the
register are driven out to the pins if the Direction register or the output enable product term
is set to '1.' The contents of the register can also be read back by the MCU.
register
Bit 7
Port G
Port A
Port B
Port C
Port D
Port E
Port F
Drive
0
Port Direction Assignment example
Drive register Pin Assignment
Bit 6
Open
Drain
Open
Drain
Open
Drain
Open
Drain
0
Bit 7
Slew
Slew
Rate
Rate
NA
Table 22
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Bit 5
Bit 6
Slew
Rate
Slew
Rate
NA
0
shows the register name, the ports having each register type,
Table
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Bit 5
Slew
Slew
Rate
Rate
NA
Bit 4
0
22, are used by the MCU to write data to or read
(1)
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Bit 4
Slew
Slew
Rate
Rate
NA
Bit 3
0
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Bit 3
Slew
Slew
Rate
Rate
Bit 2
1
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Bit 2
Slew
Slew
Rate
Rate
Bit 1
1
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Bit 1
Slew
Slew
Rate
Rate
PSD835G2
Bit 0
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Open
Drain
Bit 0
Slew
Slew
Rate
Rate
1