UPSD3422 datasheet(228/293 Pages) STMICROELECTRONICS

228 / 293 page

PSD module

uPSD34xx

228/293

28.5.37

MCU I/O mode

In MCU I/O mode, the 8032 on the MCU Module expands its own I/O by using the I/O Ports

on the PSD Module. The 8032 can read PSD Module I/O pins, set the direction of the I/O

pins, and change the output state of I/O pins by accessing the Data In, Direction, and Data

Out csiop registers respectively at run-time.

To implement MCU I/O mode, each desired pin is specified in PSDsoft Express as MCU I/O

function and given a pin name. Then 8032 firmware is written to set the Direction bit for each

corresponding pin during initialization routines (0 = In, 1 = Out of the chip), then the 8032

firmware simply reads the corresponding Data In register to determine the state of an I/O

pin, or writes to a Data Out register to set the state of a pin. The Direction of each pin may

be changed dynamically by the 8032 if desired. A mixture of input and output pins within a

single port is allowed. Figure 80 on page 226 shows the Data In, Data Out, and Direction

signal paths.

The Data In registers are defined in Table 122 to Table 125. The Data Out registers are

defined in Table 126 to Table 129 on page 229. The Direction registers are defined in

Table 130 to Table 133 on page 230.

Table 122.

MCU I/O mode port A data in register(1) (address = csiop + offset 00h)

Note:

Port A not available on 52-pin uPSD34xx devices

For each bit, 1 = current state of input pin is logic '1,' 0 = current state is logic ’0’

Table 123.

MCU I/O mode port B data in register (address = csiop + offset 01h)

Note:

For each bit, 1 = current state of input pin is logic '1,' 0 = current state is logic ’0’

Table 124.

MCU I/O mode port C data in register (address = csiop + offset 10h)

Note:

X = Not guaranteed value, can be read either '1' or '0.'

For each bit, 1 = current state of input pin is logic '1,' 0 = current state is logic ’0’

Table 125.

MCU I/O mode port D Data in register (address = csiop + offset 11h)

Note:

X = Not guaranteed value, can be read either '1' or '0.'

For each bit, 1 = current state of input pin is logic '1,' 0 = current state is logic ’0’

Not available on 52-pin uPSD34xx devices

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PB7

PB6

PB5

PB4

PB3

PB2

PB1

PB0

Bit 7Bit 6Bit 5Bit 4Bit 3Bit 2

Bit 1Bit 0

PC7

PC4

PC3

PC2

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PD2(3)

PD1

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