DS501-00024-6v1-E

5

MB85R4M2T



State Transition Diagram



FUNCTIONAL TRUTH TABLE OF BYTE CONTROL

Operation Mode

/WE

/OE

/LB

/UB

I/O0 to I/O7

I/O8 to I/O15

Read(Without Output)

H

H

×

×

Hi-Z

Hi-Z

H

×

H

H

Hi-Z

Hi-Z

Read(I/O8 to I/O15)

H

L

H

L

Hi-Z

Output

Read(I/O0 to I/O7)

L

H

Output

Hi-Z

Read(I/O0 to I/O15)

L

L

Output

Output

Write(I/O8 to I/O15)

↑

×

H

L

×

Input

Write(I/O0 to I/O7)

L

H

Input

×

Write(I/O0 to I/O15)

L

L

Input

Input

Note: H= “H” level,

L= “L” level,

↑= Rising edge,

↓= Falling edge,

×= H, L, ↓ or ↑

Hi-Z= High Impedance

In case the byte reading or writing are not selected, /LB and /UB pins shall be connected to GND pin.

In writing, please don’t switch /LB and/or /UB during /CE=”L”.

Standby

RD/WR

Operation

Sleep

Power Up

/ZZ=L

/CE=L, /ZZ=H

/CE=H,/ZZ=H

/ZZ=H