Z86C72 Datasheet, PDF (60/71 Pages) Zilog, Inc. – IR MICROCONTROLLER

Z86C72/C92/L72/L92
IR Microcontroller
Zilog
FUNCTIONAL DESCRIPTION (Continued)
Mask Selectable Options. There are six Mask Selectable
Options to choose from based on ROM code require-
ments. (See Table 7).
Table 7. Mask Selectable Options
Option
Function
Permanent Watch-Dog
Timer
On/WDT command invoked
RAM Protect
On/Off
RC/Other
RC/XTAL
32 kHz XTAL
On/Off
Port 04-07 Pull-ups
On/Off
Port 00-03 Pull-ups
On/Off
Port 31-33 Pull-ups
On/Off
Port 20-27 Pull-ups
On/Off
Port 3 Mouse Mode 0.4 V_DD On/Off
Trip
Low Voltage Detection/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_LV (Vrf1). A small further drop in
V_CC causes the XTAL1 and XTAL2 circuitry to stop the
crystal or resonator clock. Typical Low-Voltage power con-
sumption in this Low Voltage Standby mode (I_LV) is about
45 µA (varying with the number of Mask selectable options
enabled). If the V_CC is allowed to stay above V_RAM, the
RAM content is preserved. When the power level is re-
turned to above V_LV, the device will perform a POR and
function normally (Figure 45).
The minimum operating voltage varies with the tempera-
ture and operating frequency, while V_LV varies with tem-
perature only.
The Low Voltage trip voltage (V_LV) is less than 2.1V under
the following conditions:
Maximum (V_LV) Conditions:
T_A = 0°C, +55°C Internal clock frequency equal to or less
than 4.0 MHz
Note: The internal clock frequency is one-half the external
clock frequency.
1.8
1.6
1.4
VLV
1.2
1
1.8
0.6
0.4
0.2
0
0
15
25
35
45
55
Temperature
Figure 44. Typical Z86L/CX2 Low Voltage vs
Temperature at 8 MHz
6-60
PRELIMINARY
DS97LVO0900