Z8F0113 datasheet(38/245 Pages) ZILOG

38 / 245 page

PS024315-1011

P R E L I M I N A R Y

Reset Sources

Z8 Encore! XP® F0823 Series

Product Specification

Reset Sources

Table 10 lists the possible sources of a System Reset.

Power-On Reset

Each device in the Z8 Encore! XP F0823 Series contains an internal POR circuit. The

POR circuit monitors the supply voltage and holds the device in the Reset state until the

supply voltage reaches a safe operating level. After the supply voltage exceeds the POR

voltage threshold (VPOR), the device is held in the Reset state until the POR Counter has

timed out. If the crystal oscillator is enabled by the option bits, this time-out is longer.

After the Z8 Encore! XP F0823 Series device exits the POR state, the eZ8 CPU fetches the

Reset vector. Following the POR, the POR status bit in Watchdog Timer Control

(WDTCTL) Register is set to 1.

Figure 5 displays POR operation. For the POR threshold voltage (VPOR), see the Electri-

cal Characteristics chapter on page 196.

Table 10. Reset Sources and Resulting Reset Type

Operating Mode

Reset Source

Special Conditions

NORMAL or HALT

modes

Power-On Reset/Voltage Brown-

Out.

Reset delay begins after supply voltage exceeds

POR level.

Watchdog Timer time-out when

configured for Reset.

None.

RESET pin assertion.

All reset pulses less than three system clocks in

width are ignored.

OCD initiated Reset (OCDCTL[0]

set to 1).

System Reset, except the OCD is unaffected by

the reset.

STOP Mode

Power-On Reset/Voltage Brown-

Out.

Reset delay begins after supply voltage exceeds

POR level.

RESET pin assertion.

All reset pulses less than the specified analog

delay are ignored. See the Electrical Characteris-

tics chapter on page 196.

DBG pin driven Low.

None.

Z8F0113 Datasheet(PDF) 38 Page - Zilog, Inc.

Z8F0113 Datasheet(HTML) 38 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

Datasheet Download

Link URL