HT9480_02 Datasheet, PDF (3/47 Pages) Holtek Semiconductor Inc – 8-Bit Numerical Pager Controller MCU

Pin Assignment
HT9480
80
VSS
1
VDD
S E G 31
S E G 30
S E G 29
S E G 28
S E G 27
S E G 26
S E G 25
S E G 24
S E G 23
S E G 22
S E G 21
S E G 20
S E G 19
S E G 18
S E G 17
S E G 16
S E G 15
S E G 14
20
21
H T9480
8 0 L Q . P -A
(1 2 ´ 1 2 )
61
60
PB6
PB5
PB4
PB3
PB2
PB1
PB0
RES
VSS
VDD
TM R 1
PA6
PA5
PA4
PA3
PA2
PA1
PA0
VSS
41
O SC2
40
Pin Description
Pin No
Pin Name
43~49
PA0~PA6
54~61
PB0~PB7
62~63
PC0~PC1
1, 42,
52, 64
76
77
40
41
53
68
50
2, 39, 51
67
65
3~34
78~80
VSS
X1
X2
OSC1
OSC2
RES
BAF
TMR1
VDD
BZ
SEG31~SEG0
SEG34~SEG32
I/O
Function
I
7-bit input ports, with pull-high resistors
Each bit can be configured as a wake-up input by mask option.
Bidirectional 8-bit input/output ports, pull-high mask option
I/O The output structures, whether tri-state or CMOS, are determined by soft-
ware instructions.
Bidirectional 2-bit input/output ports, pull-high mask option
I/O The output structures, whether tri-state or CMOS, are determined by soft-
ware instructions.
¾ Negative power supply, ground
I X1 and X2 are connected to an external crystal to form an internal low
O power oscillator clock.
I
O
OSC1 and OSC2 are connected to an RC network or a crystal (determined
by mask option) to form the system clock oscillator. For RC operation,
OSC2 is the output terminal of the system clock.
I Schmitt trigger reset input, active low
I Battery fail interrupt with debounce circuit input
I Schmitt trigger input for timer/event counter
¾ Positive power supply
O
Buzzer non-inverting BZ output
The BZ pin outputs ²high² at buzzer off (by setting the value 00H of 1DH)
O LCD driver outputs for LCD panel segments
Rev. 1.20
3
July 31, 2002