PSD302R データシートの表示（PDF） - Waferscale Integration

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PSD302R

Low Cost Microcontroller Peripherals

Waferscale Integration 

10.

I/O Port

Functions

(cont.)

PSD3XX Family

10.3.2 Port B (PB0-PB7) in 16-bit Multiplexed Address/Data Mode

In this mode, Port B becomes the low-order data bus byte to the MCU chip. When reading

an internal high-order location, data is presented on Port B pins to the MCU. When writing

to an internal high-order location, data present on Port B pins from the MCU is written to the

desired location.

Figure 6. Port B Pin Structure

I

I

N

N

T

T

READ DATA

E

E

R

R

N

N

A

A WRITE DATA

L

L

CK

C

D

S

A

O

T

U

A

T

DFF

DR

B

B

U

U

S

S

D

C

8

READ DIR

S

•

0

•

•

•

•

D

•

1

7

5

WRITE DIR

D

DIR

CK FF

R

RESET

READ PIN

MCU

I/O

OUT

CMOS/OD (1)

PORT B PIN

Dn

MUX

ENABLE

CSn

CONTROL

NOTE: 1. CMOS/OD determines whether the output is open drain or CMOS.

19

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