HTG12B0 Просмотр технического описания (PDF) - Holtek Semiconductor
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HTG12B0 Datasheet PDF : 33 Pages
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HTG12B0
Pad Description
Pad No. Pad Name
I/O
Mask
Option
Description
4~7
PS3~PS0
94, 1~3 PM3~PM0
Pull-high or
I
None. Input pins for input only
Note 2
8
TMCLK
Pull-high Input for TIMER clock
I or None. TIMER can be clocked by an external clock or an
Note 4 internal frequency source.
9
RES
I
¾
Input to reset an internal LSI
Reset is active on logical low level.
17~14 PA3~PA0
10~13 PB3~PB0
CMOS or
NMOS with
I/O Pull-high or Input/output pins
None.
Note 3
19, 20 BZ, BZ
O
Note 1 Sound effect outputs
21
VDD
I
¾
Positive power supply
23
OSCI
22
OSCO
I
O
¾
An external resistor between OSCI and OSCO is
needed for internal system clock.
25
XIN
24
XOUT
I
O
¾
32768Hz crystal oscillator for time base, LCD
clock
26
VSS
I
¾
Negative power supply, GND
27~30 VLC1~VLC4
I
¾
LCD system power 1/4 bias generated
31~34 VOUT1~VOUT4 I
¾
LCD system voltage booster condenser connecting
terminal
35~50 COM15~COM0 O
¾
Output for LCD panel common plate
51~90 SEG39~SEG0 O
¾
LCD driver outputs for LCD panel segment
93
T512
O
18
T1D
O
92
TEST1
I
91
TEST2
I
For test mode only
TEST1 and TEST2 are left open when the chip is
in normal operation (with an internal pull-high
resistor).
Note: 1. The system clock provides six different sources selectable by mask option to drive the
sound effect clock. If the Holtek sound library is used, only 128K and 64K are acceptable.
2. Each bit of ports PM, PS can be a trigger source of the HALT interrupt, selectable by
mask option.
3. Each bit of ports PA, PB can be selected as CMOS for output pin only, or as NMOS for
I/O pin with pull-high resistor or none by mask option.
4. 14 internal clock sources can be selected by mask option to drive TMCLK. Note that
TMCLK should not be connected to a pull high resistor if an internal source is used.
5
September 8, 1999
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