Sharp SM3512 Datasheet
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SM3512
DESCRIPTION
The SM3512 is a CMOS 4-bit single-chip microcomputer for databank incorporating data memory
RAM, LCD driver, key/switch input circuit, 8-bit parallel I/O port, 2 output ports, external memory control circuit, and buzzer output circuit.
FEATURES
• ROM capacity :
Program ROM 8 k x 23 bits
Character ROM 5 x 9 x 128 bits
Constant ROM 208 x 4 bits
• RAM capacity :
Working RAM 256 x 4 bits
Display RAM 60 x 9 bits
Data RAM 8 k x 8 bits
• Memory expansion (external) : 8 k x 8 bits
• LCD display : 60 - segment x 9 -common
• I/O ports :
Parallel I/O 8 bits
Input 1 bit
Output 2 bits
Buzzer output 1 bit (4 kHz)
Key input 6 bits
• Standby release : 2 events (2 Hz signal, key input)
• Built-in oscillator :
• Instruction cycle time : 12 µs
• Operating temperature : –10 to +60°C
• Supply voltage : 2.5 to 3.4 V
• Package : 100-pin QFP (QFP100-P-1420)
SM3512
4-Bit Single-Chip Microcomputer
(For Data Bank Use)
System clock (built-in CR oscillator) 250 kHz
Timer (built-in CR oscillator) 32.8 kHz
(external crystal)
32.768 kHz
SM3512
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SYSTEM COMFIGURATION EXAMPLE
Key matrix
Expand
memory
8 k-byte
S1-S6
S7-S19
S53-S60
(MAX. 84-key)
S1-S60
CE
KI
2-KI7
DIO1-DIO8
RW
CE
KI
1 XCR VCC TEST RESET XI XO BZ
H
1-H9
VB
VM
VA
EO1
EO2
VCC
Buzzer
VCC
SM3512
ON
Key
RESET
Key
3V
Common signal
Segment signal
Individual output
+
–
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