AT89C5131A-RDTUM datasheet(37/188 Pages) ATMEL

37 / 188 page

4337K–USB–04/08

AT89C5130A/31A-M

8.3.7.3

Hardware Security

The following procedure is used to read the Hardware Security space and is summarized in

Figure 8-8:

• Map the Hardware Security space by writing 04h in FCON register.

• Read the byte in Accumulator by executing MOVC A, @A+DPTR with A = 0 & DPTR =

0000h.

Figure 8-8.

Reading Procedure

8.4

Registers

Table 8-4.

FCON (S:D1h)

Flash Control Register

Reset Value = 0000 0000b

Flash Spaces Reading

Flash Spaces Mapping

FCON = 00000xx0b

Data Read

DPTR = Address

ACC = 0

Exec: MOVC A, @A+DPTR

Erase Mode

FCON = 00h

FPL3

FPL2

FPL1

FPL0

FPS

FMOD1

FMOD0

FBUSY

Bit Number

Bit

Mnemonic Description

7-4

FPL3:0

Programming Launch Command Bits

Write 5Xh followed by AXh to launch the programming according to FMOD1:0.

(see Table 8-3.)

FPS

Flash Map Program Space

Set to map the column latch space in the data memory space.

Clear to re-map the data memory space.

2-1

FMOD1:0

Flash Mode

See Table 8-2 or Table 8-3.

FBUSY

Flash Busy

Set by hardware when programming is in progress.

Clear by hardware when programming is done.

Can not be cleared by software.

AT89C5131A-RDTUM 데이터시트(PDF) 37 Page - ATMEL Corporation

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