Z8F021ASH020SC datasheet(167/276 Pages) ZILOG

167 / 276 page

PS022815-0206

Flash Option Bits

Z8 Encore! XP® 4K Series

Product Specification

148

Flash Option Bits

Overview

Programmable Flash option bits allow user configuration of certain aspects of Z8 Encore!

XP® 4K Series operation. The feature configuration data is stored in the Flash program

memory and loaded into holding registers during Reset. The features available for control

through the Flash Option Bits are:

• Watch-dog timer time-out response selection–interrupt or system reset

• Watch-dog timer Always on (enabled at Reset)

• The ability to prevent unwanted read access to user code in Program Memory

• The ability to prevent accidental programming and erasure of all or a portion of the user

code in Program Memory

• Voltage brown-out configuration-always enabled or disabled during STOP mode to re-

duce STOP mode power consumption

• Oscillator mode selection-for high, medium, and low power crystal oscillators, or external

RC oscillator

• Factory trimming information for the internal precision oscillator and low voltage detec-

tion

• Factory calibration values for ADC, temperature sensor, and Watch-dog timer compensa-

tion

• Factory serialization and randomized lot identifier (optional)

Operation

Option Bit Configuration By Reset

Each time the Flash Option Bits are programmed or erased, the device must be Reset for

the change to take effect. During any reset operation (System Reset, Power On Reset, or

STOP Mode Recovery), the Flash Option Bits are automatically read from the Flash Pro-

gram Memory and written to Option Configuration registers. The Option Configuration

registers control operation of the devices within the Z8 Encore! XP® 4K Series. Option Bit

control is established before the device exits Reset and the eZ8 CPU begins code execu-

tion. The Option Configuration registers are not part of the Register File and are not acces-

sible for read or write access.

Z8F021ASH020SC 数据表(PDF) 167 Page - Zilog, Inc.

Z8F021ASH020SC 数据表(HTML) 167 Page - Zilog, Inc.

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

数据表下载