EM6607 datasheet(18/47 Pages) EMMICRO

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EM6607

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7.4

PortD

The EM6607 has one all purpose I/O port similar to PortC but without interrupt capability. The PortD register is used to read

input data when an input and to write output data for output. The input line can be pulled Up/Down (metal option) when the

port is used as input. Input mode is set by writing 0 to the I/O control bit CIOPD in register CPIOB, and the terminal becomes

high impedance. On each terminal controlled Pull-Up/Down resistor can be selected by metal option which are active only

when selected as input. Special case is when we want to use internal Strong pull-up resistor also when PortC terminal is

declared as N-channel open drain output and internal pull-up resistor is used to pull up the output (not-controlled pull-up).

This is a special option “sod” = strong pull-up for Open drain- active all the time (when terminal is input or output).

Output mode is set by writing 1 to the control bit CIOPD. Consequently, the terminal follows the status of the bits in the

PortD register. If Serial Write Buffer function is enabled PD0 and PD1 terminals of PortD output serial clock and serial data

respectively. For details see 11.0 Serial Write Buffer.

7.4.1

PortD registers

Table 23.

PortD Input/Output register - PortD

Bit

Name

Reset

R/W

Description

PD3

R/W

PD3 I/O data

PD2

R/W

PD2 I/O data

PD1

R/W

PD1 I/O data

PD0

R/W

PD0 I/O data

Table 24.

Ports control register - CPIOB

Bit

Name

Reset

R/W

Description

R/W

not used

CIOPD

R/W

I/O PortD select

CIOPC

R/W

I/O PortC select

PA&C

R/W

Logical AND of IRQ’s from PortA & PortC

PD[3:0]

Vdd

Mask

option

Mask

option

Mask

option

Mask

option

Mask

option

Mask

option

Sleep

PortD RD

Port D

CIOPD

OEBsleepRes

Figure 10.

Port D

If OEDsleepRes bit in Option2 register is set to “1” (Output Hi-Z in SLEEP mode) the active Output will go tri-state when the

circuit goes into SLEEP mode. In the case of OEDsleepRes at “0”, output stay active also in the SLEEP mode.

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