Z86L81 Datasheet, PDF (69/88 Pages) Maxim Integrated Products – 28-Pin Low-Voltage Infrared Microcontrollers

Z86L81/86/98
28-Pin Low-Voltage Infrared Microcontrollers
63
Mask Selectable Options
There are seven Mask Selectable Options to choose from based on ROM code
requirements. These are listed in Table 18.
Table 18. Mask Selectable Options
RC/Other
32 kHz XTAL
Port 04-07 Pull-Ups
Port 00-03 Pull-Ups
Port 20-27 Pull-Ups
Port 3 Pull-Ups
Port0: 0-3 Mouse Mode 0.4 V_DD Trip
RC/XTAL
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
Brown-Out Voltage/Standby
An on-chip Voltage Comparator checks that the V_CC is at the required level for
correct operation of the device. Reset is globally driven when V_CC falls below V_BO.
A small further drop in V_CC causes the XTAL1 and XTAL2 circuitry to stop the
crystal or resonator clock. Typical Low-Voltage power consumpion in this Low
Voltage Standby mode (I_LV) is about 20 A. If the V_CC is allowed to stay above
Vram, the RAM content is preserved. When the power level is returned to above
V_BO, 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 V_LVD. Expanded Register Bank 0Dh register 0Ch bit 0 and 1 are used
for this option.
Bit D0 is used to enable/disable this function.
Bit D1 is the status flag bit of the LVD.
19-4615; Rev 0; 4/09