參數(shù)資料
型號: HT49R30A-1
廠商: Holtek Semiconductor Inc.
英文描述: DISPL 7 SEG YELLOW
中文描述: 8位LCD型微控制器
文件頁數(shù): 21/43頁
文件大小: 353K
代理商: HT49R30A-1
HT49R30A-1/HT49C30-1/HT49C30L
Rev. 1.10
21
September 25, 2002
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LCD driver output
Low voltage reset/detector functions for
HT49R30A-1/HT49C30-1
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 op-
tions. Once the options of LVD 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 LVR has the same effect or function with the exter-
nal RES signal which performs chip reset. During HALT
state, LVR is disabled.
The definitions of RTCC register are listed in the follow-
ing table.
Register
Bit No.
Label
Read/Write
Reset
Function
RTCC
(09H)
0~2
RT0~RT2
R/W
111B
8 to 1 multiplexer control inputs to select the real
clock prescaler output
3
LVDC*
R/W
0
LVD enable/disable (1/0)
4
QOSC
R/W
0
32768Hz OSC quick start-up oscillating
0/1: quickly/slowly start
5
LVDO*
R
0
LVD detection output (1/0)
1: low voltage detected
6~7
Unused bit, read as 0
Note: * For HT49R30A-1/HT49C30-1
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