PSD813F2 datasheet(61/110 Pages) STMICROELECTRONICS

61 / 110 page

PSD8XX Family

PSD835G2

The

PSD835G2

Functional

Blocks

(cont.)

9.4.4 Port Data Registers

The Port Data Registers, shown in Table 24, are used by the microcontroller to write data

to or read data from the ports. Table 24 shows the register name, the ports having each

described below.

9.4.4.1 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.

9.4.4.2 Data Out Register

Stores output data written by the MCU in the MCU I/O output mode. The contents of the

product term is set to “1”. The contents of the register can also be read back by the

microcontroller.

9.4.4.3 Output Micro

⇔Cells (OMCs)

The CPLD OMCs occupy a location in the microcontroller’s address space. The

microcontroller can read the output of the OMCs. If the Mask Micro

⇔Cell Register bits are

not set, writing to the Micro

⇔Cell loads data to the Micro⇔Cell flip flops. Refer to the PLD

section for more details.

9.4.4.4 Mask Micro

⇔Cell Register

Each Mask Register bit corresponds to an OMC flip flop. When the Mask Register bit

is set to a “1”, loading data into the OMC flip flop is blocked. The default value is “0” or

unblocked.

9.4.4.5 Input Micro

⇔Cells (IMCs)

The IMCs can be used to latch or store external inputs. The outputs of the IMCs

are routed to the PLD input bus, and can be read by the microcontroller. Refer to the PLD

section for a detailed description.

9.4.4.6 Enable Out

The Enable Out register can be read by the microcontroller. It contains the output enable

values for a given port. A “1” indicates the driver is in output mode. A “0” indicates the

driver is in tri-state and the pin is in input mode.

Port

MCU Access

Data In

A,B,C,D,E,F,G

Read – input on pin

Data Out

A,B,C,D,E,F,G

Write/Read

Output Micro

⇔Cell A,B

Read – outputs of Micro

⇔Cells

Write – loading Micro

⇔Cells Flip-Flop

Mask Micro

⇔Cell

A,B

Write/Read – prevents loading into a given

Micro

⇔Cell

Input Micro

⇔Cell

A,B,C

Read – outputs of the Input Micro

⇔Cells

Enable Out

A,B,C,F

Read – the output enable control of the port driver

Table 24. Port Data Registers

PSD813F2 Datasheet(PDF) 61 Page - STMicroelectronics

PSD813F2 Datasheet(HTML) 61 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Descarga

Enlace URL