5 ¥ 7-Dot Character ¥ 16-Digit Display Controller/Driver
GENERAL DESCRIPTION
The MSC7128-xx is a general purpose display controller for vacuum fluorescent display tube.
The MSC7128-xx drives displays with up to 35 anodes (dots) and up to 16 grids (characters) plus
a cursor.
The controller accepts command and display data input words on a clocked serial input line.
Commands control the on/off duty cycle, starting character position, number of characters to
display and display modes (PLA mode and Lamp Test mode). An internal PLA-type character
generator provides character decoding and dot pattern generation for the full 128 characters.
• Direct drive capability for vacuum fluorescent display (no pull-down resistor is required)
• Built-in oscillation circuit
• Built-in power-on-reset circuit with external C
• Serial host interface (data in, clock, chip select)
• Serial data input for 8-bit control and display data words
• Command functions
– On/off duty cycle: 0/16 to 15/16
– Character display position: 0 to 15
– Number of display digits:1 to 16
– Display modes: PLA mode, and Lamp Test mode
• Built-in 35 x 128-bit PLA-type character generator
– Character font:5 ¥ 7
– Number of characters:128
– Programmable PLA code
• Package options:
64-pin plastic SDIP (SDIP64-P-750-1.78) (Product name : MSM7128-xxSS)
64-pin plastic QFP (QFP64-P-1420-1.00-BK) (Product name : MSM7128-xxGS-BK)
xx indicates the code number.
1/27
¡ SemiconductorMSC7128-xx
2/27
BLOCK DIAGRAM
SEG
DRIVER
LATCHPLALATCHRAM
8-BIT
SHIFT REGISTER
V
DD
CS
CP
RESET
TEST
STEP
TEST
COUNT
V
SS
OSCI
OSCO
CS
CP
RESET
OSC
SEG1
SEG2
SEG34
SEG35
SEG36
COM1
COM2
COM14
COM15
COM16
V
EE
8
8
b0-7
3
5
b4-6
COMMAND
DECODER
RL
TIMING
GENERATOR
CONTROL
RESET
RESET
CS
CP
D.G
LOAD
4
b0-3
4
b0-3
RESET
R
DUTYCYCLE REGISTER
DUTYCYCLE
COUNTER
b0-3
4
D.G
LOAD
RESET
RESET
DUTY AND
BLANK
GENERATOR
RESET
4
DIGIT
COUNT
REGISTER
BA
A = B
ADDRESS
COMP
W.A.C. COUNT
W.A.C. COUNT
W.A.C. LOAD
b0-3
4
WRITE
ADDRESS
COUNTER
READ
ADDRESS
COUNTER
44 4416
W/R
ADDRESS
SELECTOR
4
DISPLAY
DATA
BUFFER
8BITS ¥
16 WORDS
873536
fW
RAMPC
LR
ROM
PC1
ROM
PC2
fR
RESET
fDIG
RESET
LATCH
BLANK
DUTY AND BLANK
DECODER
fSEG
RESET
LT
LR S
CHARACTER
GENERATOR
35 ¥ 128 BITS
OE
OE
COM
DRIVER
DA
¡ SemiconductorMSC7128-xx
INPUT AND OUTPUT CONFIGURATION
• INPUT PIN
V
DD
DA
CS
CP
OSCI
V
DD
R
V
DD
RESET
• OUTPUT PIN
OSCO
TEST COUNT
TEST STEP
GND
V
DD
V
DD
SEG1 - 35
SEG36
COM1-16
V
V
DD
EE
V
EE
3/27
¡ SemiconductorMSC7128-xx
PIN CONFIGURATION (TOP VIEW)
OSC0
OSCI
TEST COUNT
TEST STEP
V
SS
V
EE
COM 1
COM 2
COM 3
COM 4
COM 5
COM 6
COM 7
COM 8
COM 9
COM10
COM11
COM12
COM13
COM14
COM15
COM16
SEG 36
SEG 35
SEG 34
SEG 33
SEG 32
SEG 31
SEG 30
SEG 29
SEG 28
SEG 27