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| Z86L825 Datasheet, PDF (74/79 Pages) Zilog, Inc. – 20-Pin Low-Voltage IR Microcontrollers | |||
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Z86L825/826/827
20-Pin Low-Voltage IR Microcontrollers
67
Mask Selectable Options
There are seven Mask Selectable Options to choose from based on ROM code
requirements. These are listed in Table 26.
Table 26. Mask Selectable Options
RC/Other
RC/XTAL
32 kHz XTAL
On/Off
Port 20â27 Pull-Ups
On/Off
Port 31â33 Pull-Ups
On/Off
Port 3 Mouse Mode 0.4 VDD Trip On/Off
Brown-out Voltage/Standby
An on-chip Voltage Comparator checks that the VCC is at the required level for
correct operation of the device. Reset is globally driven when VCC falls below VBO.
A further small drop in VCC causes the XTAL1 and XTAL2 circuitry to stop the
crystal or resonator clock. Typical low-voltage power consumpion in this Low Volt-
age Standby mode (ILV) is about 20 µA. If the VCC is allowed to stay above Vram,
the RAM content is preserved. When the power level is returned to above VBO,
the device performs a POR and functions normally.
PS008808-1203
PRELIMINARY
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