UPD30121 datasheet(47/76 Pages) NEC

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Data Sheet U14691EJ1V0DS00

µµµµPD30121

(9)

Page ROM parameter (1/2)

Parameter

Symbol

Condition

MIN.

MAX.

Unit

tACC1

× N − 19

Data access time (from address)

Note

tACC2

× M − 18

Data access time (from ROMCS (0:3)#

↓)Note

tCE

× N − 19

Data access time (from RD#

↓)Note

tOE

× (N − 1) − 29

Data input setup time

tDS

0ns

Data input hold time

tDH

5ns

Note

The value of N is set by using the WROMA (0:2) bits of the BCUSPEEDREG register.

The value of M is set by using the WPROM (0:1) bits of the BCUSPEEDREG register.

The value of T is set by using the CLKSEL (0:2) signals (TxD/CLKSEL2, RTS#/CLKSEL1, and

DTR#/CLKSEL0 pins).

CLKSEL 2

Signal

CLKSEL 1

Signal

CLKSEL 0

Signal

T (ns)

WROMA 2

Bit

WROMA 1

Bit

WROMA 0

Bit

(TClock)

WPROM

1 Bit

WPROM

0 Bit

(TClock)

RFU



Remarks 1. Do not set CLKSEL (2:0)

signal = 111.

2. Do not set CLKSEL (2:0)

signal = 110, 101 with

131 MHz model.

UPD30121 Datasheet(PDF) 47 Page - NEC

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