參數(shù)資料
型號(hào)： HT46R65
廠商： Holtek Semiconductor Inc.
英文描述： A/D with LCD Type 8-Bit MCU
中文描述： 在A / D液晶型8位微控制器
文件頁(yè)數(shù)： 27/48頁(yè)
文件大小： 409K
代理商： HT46R65
HT46R65/HT46C65
Rev. 1.80
27
July 14, 2005
Low Voltage Reset/Detector Functions
There is a low voltage detector (LVD) and a low voltage reset circuit (LVR) implemented in the microcontroller. These
two functions can be enabled/disabled by options. Once the LVD options is enabled, the user can use the RTCC.3 to
enable/disable (1/0) the LVD circuit and read the LVD detector status (0/1) from RTCC.5; otherwise, the LVD function is
disabled.
The RTCC register definitions are listed below.
Bit No.
Label
Function
0~2
RT0~RT2
8 to 1 multiplexer control inputs to select the real clock prescaler output
3
LVDC
LVD enable/disable (1/0)
4
QOSC
32768Hz OSC quick start-up oscillating
0/1: quickly/slowly start
5
LVDO
LVD detection output (1/0)
1: low voltage detected, read only
6, 7
Unused bit, read as 0
RTCC (09H) Register
The LVR has the same effect or function with the exter-
nal RES signal which performs chip reset. During HALT
state, both LVR and LVD are disabled.
The microcontroller provides low voltage reset circuit in
order to monitor the supply voltage of the device. If the
supply voltage of the device is within the range
0.9V~V
LVR
, such as changing a battery, the LVR will au-
tomatically reset the device internally.
The LVR includes the following specifications:
The low voltage (0.9V~V
LVR
) has to remain in their
original state to exceed 1ms. If the low voltage state
does not exceed 1ms, the LVR will ignore it and do not
perform a reset function.
The LVR uses the OR function with the external RES
signal to perform chip reset.
TherelationshipbetweenV
DD
andV
LVR
isshownbelow.
Note: V
OPR
is the voltage range for proper chip
operation at 4MHz system clock.
3 D 3
D '
D
' D .
$
3 D 3
3 D 3
$
' D .
'
)
1
E
E
1 )
$
)
)
1
Low Voltage Reset
Note:
*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
clock pulses before entering the normal operation.
*2: Since low voltage state has to be maintained in its original state for over 1ms, therefore after 1ms delay,
the device enters the reset mode.
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HT46R65-52 制造商:HOLTEK 制造商全稱(chēng):Holtek Semiconductor Inc 功能描述:A/D with LCD Type 8-Bit MCU
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