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參數資料
| 型號： | L8708H |
| 廠商： | ZiLOG, Inc. |
| 英文描述： | IR/Low-Voltage Microcontroller |
| 中文描述： | 紅外/低電壓微控制器 |
| 文件頁數： | 54/66頁 |
| 文件大?。?/td> | 599K |
| 代理商： | L8708H |
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Z86L88/81/86/87/89/73
IR/Low-Voltage Microcontroller
54
P R E L I M I N A R Y
DS96LV00800
Mask Selectable Options
.
There are seven Mask Select-
able Options to choose from based on ROM code require-
ments. These are:
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-
sumpion in this Low Voltage Standby mode (I
LV
) is about
45
μ
A (varying with the number of Mask selectable options
enabled). If the V
CC
is allowed to stay above Vram, 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.
RAM Protect
RC/Other
32 kHz XTAL
Port 04-07 Pull-Ups
Port 00-03 Pull-Ups
Port 20-27 Pull-Ups
Port 30-33 Pull-Ups
Port 3 Mouse Mode 0.4 V
DD
Trip
On/Off
RC/XTAL
On/Off
On/Off
On/Off
On/Of
On/Of
On/Off
Figure 45. Typical Z86LXX Low Voltage vs
Temperature at 8 MHZ
0
15
25
35
45
55
1.8
1.6
1.4
1.2
1
1.8
0.6
0.4
0.2
0
V
VLV
Temperature
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