FEDL2215-01

1Semiconductor

ML2215

12/26

00000H

007C7H

Phrase Control Table Area

007C8H

5FFFCH

User’s Date Area

5FFFDH

5FFFFH

Test Date Area

Figure 2.1 Mask ROM Address Map

3.

Mask Options

The following mask options are available to choose an interfacing type and an external clock frequency, as shown

in Table 3.1.

Table 3.1 Mask Options

Option

Interfacing Type

External Clock Frequency

A

3-pin Interfacing

4.096 MHz

B

3-pin Interfacing

8.192 MHz

C

3-pin Interfacing

16.384 MHz

D

2-pin Interfacing

4.096 MHz

E

2-pin Interfacing

8.192 MHz

F

2-pin Interfacing

16.384 MHz

4.

Interfacing Types

Mask option allows a user to select a interfacing type and a frequency of external clock input. Available options

are listed in Table 3.1 below.

4.1 2-pin Controlled Serial Input Interface

2-pin interfacing uses the SD and SI pins to control interfacing. Pull the

ST pin down to “L”.

Figure 4.1 Timing Chart of Serial Input

As shown in Figure 4.1, serial data input is enabled by entering 1

µsec or longer “L” input (the Start-bit input) to

the SD pin. Serial data input to the SD pin is fetched to the internal register in synchronization with the falling

edge of the SI’s 8th clock as a phrase code for a user-defined phrase.

SD

SI

NAR

BUSY

t

SDST