M3885 datasheet(77/103 Pages) RENESAS

77 / 103 page

3885 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

Software Commands

Table 21 lists the software commands. By entering a software com-

mand from the data I/O pins (D0–D7) in Write mode, specify the con-

tent of the operation, such as erase or program operation, to be per-

formed.

The following explains the content of each software command.

Read Array Command (FF16)

The read array mode is entered by writing the command code “FF16”

in the first bus cycle. When an address to be read is input in one of

the bus cycles that follow, the content of the specified address is

output from the data I/O pins (D0–D7).

The read array mode is retained intact until another command is writ-

ten.

The read array mode is also selected automatically when the device

is powered on and after it exits deep power down mode.

Command

Read array

Read status register

Clear status register

Program

Block erase

Mode

Write

Address

X(Note 4)

Data

(D0 to D7)

FF16

7016

5016

4016

2016

Mode

Read

Write

Address

WA(Note 2)

BA(Note 3)

Data

(D0 to D7)

SRD(Note 1)

WD(Note 2)

D016

First bus cycle

Second bus cycle

Notes 1: SRD = Status Register Data

2: WA = Write Address, WD = Write Data

3: BA = Block Address (Enter the maximum address of each block)

4: X denotes a given address in the user ROM area or boot ROM area.

Read Status Register Command (7016)

When the command code “7016” is written in the first bus cycle, the

content of the status register is output from the data I/O pins (D0–D7)

by a read in the second bus cycle. Since the content of the status

_____

signal must be asserted each time the status is read. The status

Clear Status Register Command (5016)

This command is used to clear the bits SR4,SR5 of the status regis-

ter after they have been set. These bits indicate that operation has

ended in an error. To use this command, write the command code

“5016” in the first bus cycle.

Table 21 Software command list (parallel I/O mode)

Cycle number

M3885 Datasheet(PDF) 77 Page - Renesas Technology Corp

M3885 Datasheet(HTML) 77 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL