HT49R30A-1 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT49R30A-1' PDF : 41 Pages View PDF
COM 0
COM 1
COM 2
COM 3
L C D s e g m e n ts O N
C O M 2 s id e lig h te d
HT49R30A-1/HT49C30-1/HT49C30L
VA
VB
VC
VSS
VA
VB
VC
VSS
VA
VB
VC
VSS
VA
VB
VC
VSS
VA
VB
VC
VSS
N o te : 1 /4 d u ty , 1 /3 b ia s , C ty p e : " V A " 3 /2 V L C D , " V B " V L C D , " V C " 1 /2 V L C D
1 /4 d u ty , 1 /3 b ia s , R ty p e : " V A " V L C D , " V B " 2 /3 V L C D , " V C " 1 /3 V L C D
1 /3 b ia s o n ly fo r H T 4 9 R 3 0 A - 1 /H T 4 9 C 3 0 - 1
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
0~2 RT0~RT2
R/W
3
LVDC*
R/W
RTCC
4
QOSC
R/W
(09H)
5
LVDO*
R
Reset
111B
0
0
0
Function
8 to 1 multiplexer control inputs to select the real
clock prescaler output
LVD enable/disable (1/0)
32768Hz OSC quick start-up oscillating
0/1: quickly/slowly start
LVD detection output (1/0)
1: low voltage detected
6~7
¾
¾
¾ Unused bit, read as ²0²
Note: ²*² For HT49R30A-1/HT49C30-1
Rev. 1.10
21
September 25, 2002
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