Z8F021ASH020SC datasheet(42/276 Pages) ZILOG

42 / 276 page

PS022815-0206

Reset, STOP Mode Recovery and Low Voltage Detection

Z8 Encore! XP® 4K Series

Product Specification

Figure 5.Power-On Reset Operation

Voltage Brown-Out Reset

The devices in the Z8 Encore! XP® 4K Series provide low voltage brown-out (VBO) pro-

tection. The VBO circuit senses when the supply voltage drops to an unsafe level (below

the VBO threshold voltage) and forces the device into the Reset state. While the supply

voltage remains below the Power-On Reset voltage threshold (VPOR), the VBO block

holds the device in the Reset.

After the supply voltage again exceeds the Power-On Reset voltage threshold, the device

progresses through a full System Reset sequence, as described in the Power-On Reset sec-

tion. Following Power-On Reset, the POR status bit in the Reset Status (RSTSTAT) regis-

ter is set to 1. Figure 6 illustrates Voltage Brown-Out operation. Refer to the chapter

Electrical Characteristics on page 212 for the VBO and POR threshold voltages (VVBO

and VPOR).

The Voltage Brown-Out circuit can be either enabled or disabled during STOP mode.

Operation during STOP mode is set by the VBO_AO Flash Option Bit. Refer to the Flash

Option Bits chapter for information about configuring VBO_AO.

VCC = 0.0V

VCC = 3.3V

VPOR

VVBO

Internal Precision

Internal RESET

signal

Program

Execution

Oscillator

Start-up

POR

counter delay

optional XTAL

counter delay

Oscillator

Crystal

Oscillator

Note: Not to Scale

Z8F021ASH020SC 数据表(PDF) 42 Page - Zilog, Inc.

Z8F021ASH020SC 数据表(HTML) 42 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

链接网址

Z8F021ASH020SC 数据表(PDF) 42 Page - Zilog, Inc.

Z8F021ASH020SC 数据表(HTML) 42 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

链接网址

数据表下载