EM6821 datasheet(13/68 Pages) EMMICRO

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EM6821

www.emmicroelectronic.com

6. Input and Output Ports

The EM6821 has:

- One 4-bit input port ( port A )

- One 4-bit input/output port. ( port B )

- One serial interface (port SP) also configurable as 4-bit I/O port

Pull-up and pull-down resistors can be added to all this ports with metal and/or register options.

6.1 Ports Overview

Table 6.1.1 Input and Output Ports Overview

Port

Mode

Mask(M:) or Register(R:)

Option

Function

Bit-wise Multifunction on Ports

[3:0]

Input

M: Pull-up

M: Pull-down (default)

R: Pull(up/down) select

R: Debouncer or direct

input for IRQ requests

and Counter

R: + or - for IRQ-edge

and counter

R: Input reset

combination

-Input

-Bit-wise interrupt request

-Software test variable

conditional jump

-PA[3],PA[0] input for the

event counter

-PA[3] input for the

millisecond counter

-Port A reset inputs

PA[3]

10 bit

event

counter

clock

start/stop

of MSC

PA[2]

PA[1]

PA[0]

10 bit

event

counter

clock

[3:0]

Individual

input or

output

R: CMOS or

Nch. open drain output

R: Pull-down on input

R: Pull-up on input

-Input or output

-PB[3] for the PWM output

-PB[2:0] for the Ck[16,11,1]

output

-Tristate output

PB[3]

PWM

output

PB[2]

Ck[16]

output

PB[1]

Ck[11]

output

PB[0]

Ck[1]

output

[3:0]

Serial I/O

port-wise

input /

output

R: CMOS or

Nch open drain output

R: Pull-down on input

R: Pull-up on input

-PSP[3], serial clock out

-PSP[2], serial data out

-PSP[1], serial status out

-PSP[0], serial data in

-PSP[3:0] 4-bit input/output

-Tristate output

PSP[3]

Serial

clock

output

SCLK

PSP[2]

Serial

data

output

SOUT

PSP[1]

Ready or

Ready/CS

PSP[0]

Serial

data

input

SIN

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