Z8F082ASH020SC datasheet(154/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

Flash Memory

Z8 Encore! XP® F08xA Series

Product Specification

136

Program Memory Address[15:9] = PAGE[6:0]. For the Z8F04xx and Z8F02xx devices,

the upper 4 bits must always be 0. For the Z8F01xx devices, the upper 5 bits must always

to 0.

Flash Sector Protect Register

The Flash Sector Protect register is shared with the Flash Page Select Register. When the

Flash Control Register

is written with 73H followed by 5EH, the next write to this

address targets the Flash Sector Protect Register. In all other cases, it targets the Flash

Page Select Register.

This register selects one of the 8 available Flash memory sectors to be protected. The reset

state of each Sector Protect bit is an unprotected state. After a sector is protected by setting

its corresponding register bit, it cannot be unprotected (the register bit cannot be cleared)

without powering down the device.

SPROT7-SPROT0—Sector Protection

Each bit corresponds to a 1024 byte Flash sector. For the Z8 Encore! XP® F08xA Series

devices all bits are used.

Flash Frequency High and Low Byte Registers

The Flash Frequency High and Low Byte registers combine to form a 16-bit value,

FFREQ, to control timing for Flash program and erase operations. The 16-bit binary Flash

Frequency value must contain the system clock frequency (in KHz) and is calculated using

the following equation:.

Flash programming and erasure is not supported for system clock frequencies below

20KHz or above 20MHz. The Flash Frequency High and Low Byte registers must be

loaded with the correct value to ensure proper operation of the device.

Table 82. Flash Sector Protect Register (FPROT)

BITS

FIELD

SPROT7

SPROT6

SPROT5

SPROT4

SPROT3

SPROT2

SPROT1

SPROT0

RESET

000

R/W

R/WR/W

ADDR

FF9H

FFREQ[15:0]

FFREQH[7:0],FFREQL[7:0]

{}

System Clock Frequency

1000

---------------------------------------------------------------

Caution:

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