R

EM6607

Copyright © 2005, EM Microelectronic-Marin SA

13

www.emmicroelectronic.com

7

INPUT and OUTPUT ports

The EM6607 has five independent 4-bit ports, as shown in Table below

Table 11.

Input / Output Ports Overview

Port

Mode

Mask Options

Function(s)

PA(0:3)

Input

Pull-Up/Down

RESET combination

Input Interrupt

Software Test Variable

PA3 input for event counter

RESET input(s)

PB(0:3)

Individual input or output

(high Current)

Nch open drain output

Pull-Up/Down on input

Input or Output

PB0 for buzzer output in 24-pin version

High Current outputs

PC(0:3)

Port input or output

Pull-Up/Down

Nch open drain output

Input or Output Port

Interrupt

PD(0:3)

Port input or Output

Pull-Up/Down on Input

Nch open drain output

Input or Output Port

PD0 -SWB serial clock output

PD1 -SWB serial data output

PE(0:3)

Individual input or output

Pull-Up/Down on Input

Nch open drain output

Input or Output Port

PE0 for buzzer output in 28-pin version

(*) Some options can be set also by Option register.

Table 12.

Option register - Option

Bit

Name

Reset

R/W

Description

3

IRQedgeR

0

R/W

Rising edge interrupt for portA&C

2

debPCN

0

R/W

PortC without/with debouncer

1

debPAN

0

R/W

PortA without/with debouncer

0

NoWD

0

R/W

WatchDog timer Off

IRQedgeR :

Valid for both PortA and PortC input interrupt edge. By default interrupt are active on a falling edge. When

set to 1 the rising edge is active.

debPAN :

By default (after a reset) debouncers are enabled on whole PortA. Writing 1 removes the debouncers from

the PortA.

debPCN :

By default debouncers are enabled on whole PortC. Writing 1 removes the debouncers from the PortC.

NoWD :

By default Watchdog timer is On (NoWD=0). Writing 1 removes the watchdog timer.

7.1

PortA

The EM6607 has one 4-bit general purpose input port. Each of the input port terminals PA3..PA0 has an internal pull-

Up/Down resistor, which can be selected with mask options. Port information is directly read from the pin into a register.

On inputs PA0, PA1, PA2 and PA3 debouncers for noise rejection are added by default. For interrupt generation, either

direct input and debounced input can be chosen. With the debPAN written to 0 in the Option register all the PortA inputs are

debounced and with the debPAN bit at 1 none of the PortA inputs are debounced. With the debouncer selected the input

must be stable for two rising edges of 1024Hz or 128Hz clocks (at 32kHz). This corresponds to a worst case of 1.95ms or

15.62msec. PortA terminals PA0, PA1 and PA2 are also used as input conditions for conditional software branches as

shown on the next page: