EM65XX

Copyright

© 2005, EM Microelectronic-Marin SA

7

www.emmicroelectronic.com

3.

EM6504

Input / Output ports

The EM6504 - MFP version of EM6604 has no input pull-up or pull-down resistors. User has to put

an external resistor if needed in the application. In metal ROM version (EM6604) user can select

resistors described in Electrical parameters and Input/Output port mask option.

For PortC Input/Output selection there is an additional register in EM6504 (register PcOE at address

60hex) instead of metal mask in EM6604.

For PortA Rising/Falling Interrupt edge selection there is an additional register in EM6504 (register

PaIRQedge at address 63hex) instead of metal mask in EM6604.

PortC Input/Output metal options are replaced by register PcOE in EM6504 MFP version.

This register is described below.

Input / Output ports option

Output

Clocked

Pull-Down

R > 1M?

Clocked

Pull-Up

R >

1M?

Pull-

Down

R = 30k?

Pull-Down

R =

150k?

Pull-Up

R = 30k?

Pull-Up

R =

150k?

No

Input

Pull-Up

or

Pull-

Down

0

1

2

3

4

5

6

7

A0

PA0 input

x

A1

PA1 input

x

A2

PA2 input

x

A3

PA3 input

x

C0

PC0 In/Out

PCoe0

x

C1

PC1 In/Out

PCoe1

x

C2

PC2 In/Out

PCoe2

x

C3

PC3 In/Out

PCoe3

x

the MFP EM6504 option selection is showed by « x » and « PCoex »

PortA interrupt edge

This metal options are replaced by register PaIRQedge in EM6504 MFP version. The register is described

below.

PortA interrupt edge option

Interrupt on Input’s rising edge

Interrupt on Input’s falling edge

8

9

I0

PA0 – IRQ

PA0r = 1

PA0r = 0

I1

PA1 – IRQ

PA1r = 1

PA1r = 0

I2

PA2 – IRQ

PA2r = 1

PA2r = 0

I3

PA3 – IRQ

PA3r = 1

PA3r = 0

the MFP EM6504 PortA interrupt edge option is selected by values in register PaIRQedge