M34551 View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

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M34551

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4551 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for

INFRARED REMOTE CONTROL TRANSMITTER

DATA MEMORY (RAM)

1 word of RAM is composed of 4 bits, but 1-bit manipulation

(with the SB j, RB j, and SZB j instructions) is enabled for the

entire memory area. A RAM address is specified by a data

pointer. The data pointer consists of registers Z, X, and Y. Set a

value to the data pointer certainly when executing an instruction

to access RAM.

RAM includes the area corresponding to the LCD. A segment is

turned on automatically when “1” is written in the bit

corresponding to the segment.

Table 2 shows the RAM size. Figure 12 shows the RAM map.

Table 2 RAM size

Product

M34551M4

M34551E8

RAM size

280 words ! 4 bits (1120 bits)

RAM 280 words ! 4 bits (1120 bits)

Register Z

0

Register X 0 1 2 3 ••• 6 7 •••••• 15 0

0

1

2

3

4

5

6

7

8

0

9

1

10

2

11

3

12

4

13

5

14

6

15

7

1

1

2

8 16

9 17

10 18

11 19

12

13

14

15

280 words

Notes 1: The area marked “–” (Z = 1, X = 0 to 2, Y = 0 to 7) is not a memory area.

2: The numbers in the shaded area indicate the corresponding segment output pin numbers.

Fig. 12 RAM map

12

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