Document
Ordering number: EN2076D
No. 2076D
CMOS LSI
LC6520C, 6522C, LC6520H, 6522H
Single-Chip 4-Bit Microcomputers for Medium/Large-Scale Control-Oriented Applications
The LC6520C/H are single-chip 4-bit microcomputers that contain a 4K-byte ROM, 1 K-bit RAM, have 42 pins, and are fabricated using CMOS process technology. Besides 8 input/output common ports of 32 pins and an input port of 4 pins, the LC6520C/H have specific ports that are used to provide the interrupt function, 4-bit/8-bit serial input/output function, and burst pulse output function. All output ports are of the open drain type with a withstand voltage of 15 V and a drive current of 20 mA and have the option of containing a pull-up resistance bitwise. The LC6520C/H are the same as our LC6500 series in the basic architecture of the CPU and the instruction set, but are made more powerful in the stack level and the cycle time. The LC6522C/H are the same as the LC6520C/H, except that they contain a 2k-byte ROM, 512-bit RAM.
Features
• Instruction set with 80 instructions {Common to the LC6500 series)
• ROM/RAM
: 4096 bytes/1024 bits (LC6520C/H)
: 2048 bytes/512 bits < LC6522C/H)
• Instruction cycle time: 6/is
(C version, VQD = 3 to 5.5V)
2.77 Ms (C version, V Q D ~ 4 to 5.5V)
9.92 MS (H version, V Q D = 4.5 to 5.5V)
• Serial input/output interface x 1 (4 bits/8 bits program-selectable)
• I/O ports
Input port:
4 pins
Input/output common ports: 32 pins
Input* input/output withstand voltage: 15 V max (all input* input/output ports)
Output current:
20 mA max (all output ports)
Pull-up resistance:
May be contained bitwise by option. (All output ports)
Output level during reset:
For ports C, D, output (H or L) during reset may be specified portwise by option.
Package Dimensions 3025B-D42SIC (unit: mm)
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Pin Name
When mounting the QIP version on the board, do not dip it in solder. Nothing must be connected to NC pin.
OSC1, OSC2: RC, ceramic resonator, or X'tal for OSC
INT:
Interrupt
RES:
Reset
PAO-3
Input/output common port
PBO-3
Input port
PCO-3
PDO-3
PEO-3
PFO-3
Input/output common port
PGO-3
PIO-3:
PJO-3:
SCK:
SO: Serial Input/output port
SI:
TEST:
Test
No. 2076-2/29
LC6520C ,6520H,6522C ,6522H
Pin Description Pin Name Pins
I/O
Functions
Options
During Reset
VDD
vss
0SC1
OSC2
PA0 PAi PA2 PA3
PB0 PBi PB2 PB3 PCo PCI PC2 PC3
1 Power supply 1
1
Input
• Pin for externally connecting R, (1) External clock input
C o r a ceramic resonator for
(2) 2-pin RCOSC
1
Output
system clock generation • For the external clock mode, the
OSC2 pin is open.
(3) 2-pin ceramic resonator OSC
(4) Predivider option 1. No. predivider
2. 1/3 predivider
3. 1/4 predivider
4 Input/output • I nput/output common port Ao to (1) Open drain type
3-
4-bit input {IP instruction) 4-bit output (OP instruction) Single-bit decision (BP, BNP instructions)
output (2) With pull-up
resistance (1), (2): Specified bit
by bit.
Single-bit set/reset (SPB, RPB
instructions)
• Standby is controlled by the PA3
(or PAo to 3 ) .
• The PA3 (or PAo to 3) pin must be free from chattering during the
HALT instruction execution cycle.
• " H " output (Output Nch transistor OFF)
4
Input
• Input Port Bo to 3
4-bit input (IP instruction)
Single-bit decision (BP, BNP
instructions)
4 Input/output • Input/output common port Co.