參數(shù)資料
型號: GMS87C7216LQ
廠商: Electronic Theatre Controls, Inc.
元件分類: 數(shù)學(xué)處理器
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 8位單晶片微控制器
文件頁數(shù): 86/121頁
文件大?。?/td> 1645K
代理商: GMS87C7216LQ
GMS81C7208/7216
82
FEB. 2005 Ver 1.04
23. POWER FAIL PROCESSOR
The GMS81C7208/16 has an on-chip low voltage detection cir-
cuitry to detect the V
DD
voltage. A configuration register, LVDR
(address 0FB
H
), can enable or disable the low voltage detect cir-
cuitry. Whenever V
DD
falls close to or below 2.2V, the LVD0 is
just set to “1”, and if it recovering 3.4V, LVD0 is held to “1”. If
V
DD
falls below around 3.4V range, the low voltage situation
may reset the MCU or freeze the clock according to setting of bit
5 (LVDM) of LVDR . The bit 4 LVD1 function is same with
LVD0 except different voltage level 2.1V. The detection voltage
is varied very little. See "7.3 DC Electrical Characteristics" on
page 10 for more detail voltage level.
In the in-circuit emulator, power fail function is not implemented
and user may not use it. Therefore, after completed development
of user program, this function may be experimented or evaluated
using by OTP.
When power fail certainly occur the MCU was reset, program no-
tify this Reset circumstance cause by LVD function. So, does not
erase the all RAM contents and operates subsequently as shown
in Figure .
Figure 23-1 Low Voltage Detector Register
7
6
5
4
3
2
1
0
LVDE
INITIAL VALUE: 00
H
ADDRESS: 0FB
H
LVDR
R/W
R/W
R/W
LVD1
Operation Mode
0: Clock freeze
1: Reset
Enable / Disable flag
0: Disable
1: Enable
LVDS
LVD0
Power Fail Voltage Selection
0: 3.4V
1: 2.1V
R/W
LVDM
V
Detection Flag 1
0: Above 3.4V
1: Below 3.4V
V
Detection Flag 2
0: Above 2.1V
1: Below 2.1V
Figure 23-2 S/W Example for RESET by Power Fail
FUNTION
EXECUTION
INITIALIZE RAM DATA
LVD0 =1
NO
RESET VECTOR
INITIALIZE ALL PORTS
INITIALIZE REGISTERS
RAM CLEAR
YES
Skip the initial routine when
the Reset cause from power fail.
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