MD82C54/B Intersil, MD82C54/B Datasheet - Page 8

• Manufacturer Part Number: MD82C54/B
• Manufacturer: Intersil
• Type: Programmabler

Specifications of MD82C54/B

• # Internal Timers: 1
• Propagation Delay Time: 260ns
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Package Type: CDIP
• High Level Output Current: -2.5mA
• Low Level Output Current: 2.5mA
• Pin Count: 24
• Operating Temp Range: -55C to 125C
• Operating Temperature Classification: Military
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Not Compliant

Since the Control Word Register and the three Counters have
separate addresses (selected by the A1, A0 inputs), and each
Control Word specifies the Counter it applies to (SC0, SC1
bits), no special instruction sequence is required. Any
programming sequence that follows the conventions above is
acceptable.
CONTROL WORD FORMAT
A1, A0 = 11; CS = 0; RD = 1; WR = 0
NOTE: Don’t Care bits (X) should be 0 to insure compatibility with
future products.
RW1 RW0
SC1
M2
D7
0
0
1
1
SC1
X
X
0
0
1
1
0
0
1
1
0
1
0
1
0
1
M1
SC0
0
0
1
1
0
0
Binary Counter 16-bit
Binary Coded Decimal (BCD) Counter (4 Decades)
D6
SC0
Counter Latch Command (See Read Operations)
Read/Write least significant byte only.
Read/Write most significant byte only.
Read/Write least significant byte first, then most
significant byte.
0
1
0
1
BCD - BINARY CODED DECIMAL
M0
0
1
0
1
0
1
RW1
D5
Select Counter 0
Select Counter 1
Select Counter 2
Read-Back Command (See Read Operations)
SC - SELECT COUNTER
Mode 0
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
RW - READ/WRITE
RW0
D4
M - MODE
8
M2
D3
M1
D2
M0
D1
BCD
D0
82C54
Control Word - Counter 0
LSB of Count - Counter 0
MSB of Count - Counter 0
Control Word - Counter 1
LSB of Count - Counter 1
MSB of Count - Counter 1
Control Word - Counter 2
LSB of Count - Counter 2
MSB of Count - Counter 2
Control Word - Counter 0
Control Word - Counter 1
Control Word - Counter 2
LSB of Count - Counter 2
LSB of Count - Counter 1
LSB of Count - Counter 0
MSB of Count - Counter 0
MSB of Count - Counter 1
MSB of Count - Counter 2
Control Word - Counter 2
Control Word - Counter 1
Control Word - Counter 0
LSB of Count - Counter 2
MSB of Count - Counter 2
LSB of Count - Counter 1
MSB of Count - Counter 1
LSB of Count - Counter 0
MSB of Count - Counter 0
POSSIBLE PROGRAMMING SEQUENCE
POSSIBLE PROGRAMMING SEQUENCE
POSSIBLE PROGRAMMING SEQUENCE
A1
A1
A1
1
0
0
1
0
0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
0
0
0
0
A0
A0
A0
1
0
0
1
1
1
1
0
0
1
1
1
0
1
0
0
1
0
1
1
1
0
0
1
1
0
0