參數(shù)資料
型號(hào)： ST2202
廠商： Electronic Theatre Controls, Inc.
英文描述： 8 BIT Integrated Microcontroller with 256K Bytes ROM
中文描述： 8位微控制器集成256K字節(jié)ROM的
文件頁(yè)數(shù)： 60/65頁(yè)
文件大?。?/td> 1946K
代理商： ST2202
Sitronix
ST2202
Ver 2.0a
60/65
2003-May-05
2
2
2
2
.
.
L
L
O
O
W
V
V
O
O
L
L
T
T
A
A
G
G
E
E
D
D
E
E
T
T
E
E
C
C
T
T
O
O
R
R
ST2202 has a built-in low voltage detector for power
management. The typical active level of voltage detection is
2.6V. When
LVDEN
(
SYS[0]
) is set, detector circuit is
enabled and the detection result will be outputted at the
same bit after 3
μ
s. Using read instruction twice can get
this result: first read will enable initial stableness control.
Second read equal '0' represents 'low voltage'. Once low
voltage detector is enabled, it keeps on consuming power.
So it is important that remember to write “0” to LVDET to
disable the detector after detection is completed. One
sample program is shown below:
Start:
SMB0
<SYS
; enable detector
:
Wait 3
μ
s
:
SEC
BBS0
BBS0
Low_Voltage
:
CLC
Normal_Voltage:
RMB0
<SYS,$+3
<SYS,
Normal_Voltage
<SYS
; disable detector
TABLE 22-1 System Control Register (SYS)
Bit 6
Bit 5
Bit 4
OSTP
XSTP
XBAK
OSTP
XSTP
XBAK
Address Name
R/W
R
W
Bit 7
XSEL
XSEL
Bit 3
WSKP
WSKP
Bit 2
WAIT
WAIT
Bit 1
IRREN
IRREN
Bit 0
HIGH
LVDEN
Default
0000 0001
0000 0000
$030
SYS
Bit 0:
LVDEN
: Low voltage detector control bit (W)
0
= Disable detector
1 = Enable detector
Bit 0:
HIGH
: Low voltage detector result (R)
0 = Voltage is low
1
= Voltage is normal
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