ZUSBOPTSC01ZACG datasheet(174/282 Pages) ZILOG

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PS022827-1212

P R E L I M I N A R Y

Flash Control Register Definitions

Z8 Encore! XP® F082A Series

Product Specification

157

Flash Sector Protect Register

The Flash Sector Protect (FPROT) Register is shared with the Flash Page Select Register.

When the Flash Control Register is written with 5EH, the next write to this address targets

the Flash Sector Protect Register. In all other cases, it targets the Flash Page Select Regis-

ter.

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.

Flash Frequency High and Low Byte Registers

The Flash Frequency High (FFREQH) and Low Byte (FFREQL) 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:

Table 83. Flash Sector Protect Register (FPROT)

Bit

Field

SPROT7

SPROT6

SPROT5

SPROT4

SPROT3

SPROT2

SPROT1

SPROT0

RESET

00000000

R/W

R/WR/W

R/WR/WR/WR/WR/WR/W

Address

FF9H

Bit

Description

[7:0]



SPROTn

Sector Protection

Each bit corresponds to a 1024-byte Flash sector on devices in the 8K range, while the

remaining devices correspond to a 512-byte Flash sector. To determine the appropriate Flash

memory sector address range and sector number for your Z8F082A Series product, please

refer to Table 78 on page 146 and to Figure 21, which follows the table.

• For Z8F08xA and Z8F04xA devices, all bits are used.

• For Z8F02xA devices, the upper 4 bits are unused.

• For Z8F01xA devices, the upper 6 bits are unused.

FFREQ[15:0]

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



System Clock Frequency

1000

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