IA88C00-PDW48I-R datasheet(62/80 Pages) INNOVASIC

62 / 80 page

IA88C00

Data Sheet

Microcontroller

As of Production Version -01

ENG21 1 030617-04

www.Innovasic

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Innovasic Semiconductor

Page 62 of 80

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Port 2 and 3

Ports 2 and 3 provide external control inputs and outputs for the UART, handshake channels and

counter/timers. The pin assignments appear in Figure 60. Bits not used for control I/O can be configured

as general purpose I/O lines and/or external interrupt inputs.

Those bits configured for general I/O can be configured individually for input for output. Those

configured for output can be individually configured for (1) input or output and (2) open drain or push

pull output.

Figure 60. Pin Assignments for Port 2 and 3

Port 2

Bit Function

Port 3

Bit Function

0 UART receive clock

1 UART transmit

2 Reserved

3 Reserved

4 Handshake 0 input

4 Handshake 1 input/WAIT

5 Handshake 0 output

5 Handshake 1 output/DM

6 Counter 0 input

6 Counter 1 input

7 Counter 0 I/O

7 Counter 1 I/O

Port 4

Port 4 can be assigned as general I/O or as the lower address byte in de-mux mode. As general I/O, each

bit can be configured individually as input or output, with either push-pull or open-drain outputs. I/O

directions is controlled by mode control reg R246. Push-pull or open_drain selection is controlled by

mode control reg R247. All Port 4 inputs are Schmitt-triggered. Port 4 can be placed under handshake

control handshake channel 0. Port 4 register address is R212.

UART

The UART is a full-duplex asynchronous channel. It transmits and receives independently at 5 to 8 bits

per character and contains options for even- or odd-bit parity and a wake-up feature.

Data can be read into or out of the UART via R239, Bank 0. This single address is able to serve a full-

duplex channel because it contains two complete 8-bit registers, one for the transmitter and the other for

the receiver. The programming model for the UART is outlined in R235 (UART Transmit Control),

R236 (UART Receive Control), R237 (UART Interrupt Enable), R238 (Transmit Interrupt Register)

R248/249 bank 1 (UART Baud Rate Generator), R250/251 bank 1 (UART Mode A/B Registers).

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