MB91302A datasheet(9/135 Pages) FUJI

9 / 135 page

MB91301 Series

■ PIN DESCRIPTIONS

• Except for Power supply, GND, and Tool pins

(Continued)

Pin no.

Pin name

I/O circuit

type

Function

MB91302A

MB91V301A

132 to 139

166 to 169,

172 to 175

D00 to D07

External data bus bits 0 to 7. It is available in the

external bus mode.

P00 to P07

Can be used as ports in 8-bit or 16-bit external bus

mode.

142 to 144,

1 to 5

178 to 180, 2,

5 to 8

D08 to D15

External data bus bits 8 to 15.

It is available in the external bus mode.

P10 to P17

Can be used as ports in 8-bit or 16-bit external bus

mode.

8 to 15

11 to 18

D16 to D23

External data bus bits 16 to 23.

It is available in the external bus mode.

P20 to P27

Can be used as ports in 8-bit external bus mode.

18 to 25

21 to 24,

27 to 30

D24 to D31

External data bus bits 24 to 31.

It is available in the external bus mode.

RDY

External ready input. The pin has this function when

external ready input is enabled.

P80

General purpose input/output port. The pin has this

function when external ready input is disabled.

BGRNT

Acknowledge output for external bus release.

Outputs "L" when the external bus is released. The

pin has this function when output is enabled.

P81

General purpose input/output port. The pin has this

function when output is disabled for external bus

release acknowledge.

BRQ

External bus release request input. Input "1" to

request release of the external bus. The pin has this

function when input is enabled.

P82

General purpose input/output port. The pin has this

function when the external bus release request

input is disabled.

External bus read strobe output.

WR0/ (UUB) /

DQMUU

External bus write strobe output. When WR is used

as the write strobe, this becomes the byte-enable

pin (UUB).

Select signal (DQMUU) of D31 to D24 at using of

SDRAM.

MB91302A Datasheet(PDF) 9 Page - Fuji Electric

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