Z8F160x Zilog, Z8F160x Datasheet - Page 46
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Z8F160x
Manufacturer Part Number
Z8F160x
Description
Z8 Encore / Microcontrollers with Flash Memory and 10 Bit A/D Converter
Manufacturer
Zilog
Datasheet
1.Z8F160X.pdf
(246 pages)
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Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
®
Z8 Encore!
28
threshold voltage, V
) and forces the device into the Reset state. While the supply volt-
VBO
age remains below the Power-On Reset voltage threshold (V
), the VBO block holds
POR
the Z8F640x family device in the Reset state.
After the supply voltage again exceeds the Power-On Reset voltage threshold, the
Z8F640x family device progresses through a full System Reset sequence, as described in
the Power-On Reset section. Following Power-On Reset, the POR status bit in the Watch-
Dog Timer Control (WDTCTL) register is set to 1. Figure 63 illustrates Voltage Brown-
Out operation. Refer to the Electrical Characteristics chapter for the VBO and POR
threshold voltages (V
and V
).
VBO
POR
Stop mode disables the Voltage Brown-Out detector.
VCC = 3.3V
VCC = 3.3V
V
POR
V
VBO
Program
Voltage
Program
Execution
Brownout
Execution
WDT Clock
Crystal Oscillator
XOUT
Internal RESET
signal
POR
XTAL
counter delay
counter delay
Figure 63. Voltage Brown-Out Reset Operation (not to scale)
Watch-Dog Timer Reset
If the device is in normal or Halt mode, the Watch-Dog Timer can initiate a System Reset
at time-out if the WDT_RES Option Bit is set to 1. This is the default (unprogrammed) set-
ting of the WDT_RES Option Bit. The
status bit in the WDT Control register is set to
WDT
signify that the reset was initiated by the Watch-Dog Timer.
PS017610-0404
Reset and Stop Mode Recovery
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