Z8F021ASH020SC datasheet(166/276 Pages) ZILOG

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PS022815-0206

Flash Memory

Z8 Encore! XP® 4K Series

Product Specification

147

SPROT7-SPROT0—Sector Protection

Each bit corresponds to a 512 byte Flash sector. For the Z8F04xx devices all bits are used.

For the Z8F02xx devices, the upper 4 bits are unused. For the Z8F01xx devices, the upper

6 bits are unused.

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:.

The Flash Frequency High and Low Byte registers must be loaded with the correct value

to ensure proper operation of the device. Also, Flash programming and erasure is not

supported for system clock frequencies below 20 KHz or above 20 MHz.

FFREQH—Flash Frequency High Byte

High byte of the 16-bit Flash Frequency value.

FFREQL—Flash Frequency Low Byte

Low byte of the 16-bit Flash Frequency value.

Table 85. Flash Frequency High Byte Register (FFREQH)

BITS

FIELD

FFREQH

RESET

000

R/W

R/WR/W

ADDR

FFAH

Table 86. Flash Frequency Low Byte Register (FFREQL)

BITS

FIELD

FFREQL

RESET

R/W

ADDR

FFBH

FFREQ[15:0]

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

{}

System Clock Frequency

1000

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

Caution:

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