ID82C54 Intersil, ID82C54 Datasheet - Page 8

• Manufacturer Part Number: ID82C54
• Description: IC INTERVAL TIMER PROGRAM 24-DIP
• Manufacturer: Intersil
• Type: Programmable Timerr

Specifications of ID82C54

• Frequency: 8MHz
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 10mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-CDIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Count: -

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