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| Z86D73 Datasheet, PDF (73/92 Pages) Zilog, Inc. – 40/44/48-Pin Low-Voltage IR OTP | |||
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Z86D73
40/44/48-Pin Low-Voltage IR OTP
67
Mask Selectable Options
There are seven Mask Selectable Options to choose from based on ROM code
requirements. These are listed in Table 19.
Table 19. Mask Selectable Options
RC/Other
32 kHz XTAL
Port 00â03 Pull-Ups
Port 04â07 Pull-Ups
Port 10â13 Pull-Ups
Port 14â17 Pull-Ups
Port 20â27 Pull-Ups
Port 3: Pull-Ups
Port 0: 0â3 Normal Mode (0.5 VDD Input Threshold) versus Mouse Mode
(0.4 VDD Input Threshold)
RC/XTAL
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
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 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 Voltage
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.
Low-Voltage Detection and Flag
A Low-Voltage Detection circuit can be used optionally when the voltage
decreases to VLVD. Expanded Register Bank 0Dh register 0Ch bits 0 and 1 are
used for this option. Bit D0 is used to enable/disable this function; bit D1 is the sta-
tus flag bit of the LVD.
PS019402-1103
PRELIMINARY
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