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CMOS Programmable Interval Timer

Below is the parameter table and instructions for the CS82C54-10 Programmable Interval Timer (PIT).

CS82C54-10 Parameter Table

Parameter	Symbol	Conditions	Min	Typical	Max	Unit
Operating Voltage	Vcc	Continuous	4.75	5.0	5.25	V
Maximum Current	Icc	Continuous	-	150	-	mA
Output High Level Voltage	VOH	IOH = -1.6 mA	2.4	3.5	4.5	V
Output Low Level Voltage	VOL	IOL = 16 mA	0.4	0.5	0.6	V
Input High Level Voltage	VIH	-	2.0	3.5	5.0	V
Input Low Level Voltage	VIL	-	0.0	0.8	1.5	V
Maximum Operating Frequency	fmax	-	-	10	-	MHz
Minimum Pulse Width	tPW	-	50	-	-	ns
Setup Time	tSU	-	25	-	-	ns
Hold Time	tH	-	25	-	-	ns
Propagation Delay	tPD	-	50	100	150	ns

CS82C54-10 Instructions

Overview

The CS82C54-10 is a programmable interval timer that can be used to generate precise time intervals or periodic signals. It consists of three independent 16-bit counters.

Pin Configuration

Pin Number	Pin Name	Description
1	GND	Ground
2	CLK0	Clock input for Counter 0
3	OUT0	Output from Counter 0
4	GATE0	Gate input for Counter 0
5	CLK1	Clock input for Counter 1
6	OUT1	Output from Counter 1
7	GATE1	Gate input for Counter 1
8	CLK2	Clock input for Counter 2
9	OUT2	Output from Counter 2
10	GATE2	Gate input for Counter 2
11	RD	Read control input
12	WR	Write control input
13	CS	Chip select input
14	A0	Address input 0
15	A1	Address input 1
16	D0-D7	Data bus (8-bit)
17	Vcc	Power supply

Programming Modes

The CS82C54-10 supports six operating modes for each counter:

1. Mode 0: Interrupt on Terminal Count
   • The counter counts down to zero and generates an interrupt.
2. Mode 1: Hardware Retriggerable One-Shot
   • The counter counts down to zero and stops. It can be retriggered by a gate pulse.
3. Mode 2: Rate Generator
   • The counter generates a periodic output signal with a frequency determined by the initial count.
4. Mode 3: Square Wave Mode
   • The counter generates a square wave with a period determined by the initial count.
5. Mode 4: Software Triggered Strobe
   • The counter counts down to zero and generates a single pulse.
6. Mode 5: Hardware Triggered Strobe (Retriggerable)
   • The counter counts down to zero and generates a single pulse, which can be retriggered by a gate pulse.

Register Addresses

• Counter 0: Address 00 (A1A0 = 00)
• Counter 1: Address 01 (A1A0 = 01)
• Counter 2: Address 10 (A1A0 = 10)
• Control Word Register: Address 11 (A1A0 = 11)

Control Word Format

The control word register is used to program the operating mode and other parameters of the counters.

Bit	Function
7	BCD/ Binary (1 = BCD, 0 = Binary)
6-5	Mode (00 = Mode 0, 01 = Mode 1, 10 = Mode 2, 11 = Mode 3, 100 = Mode 4, 101 = Mode 5)
4	Counter Select (1 = Counter 2, 0 = Counter 1 or 0)
3	Read/Write (1 = Read, 0 = Write)
2-0	Counter Select (000 = Counter 0, 001 = Counter 1, 010 = Counter 2, 011 = All Counters)

Example Programming Sequence

1. Select Counter and Mode:

   • Write the control word to the control word register to select the counter and its operating mode.
   • Example: To set Counter 0 to Mode 2 (Rate Generator) in binary mode:

     Control Word: 00110000 (0x30)
     

     • Write 0x30 to the control word register (A1A0 = 11).

2. Load Initial Count:

   • Write the initial count value to the selected counter.
   • Example: To load an initial count of 10000 (0x2710) into Counter 0:

     Write 0x10 to D0-D7 (LSB)
     Write 0x27 to D0-D7 (MSB)
     

3. Start the Counter:

   • The counter starts counting down from the initial count when the gate signal (GATE0) is high.

Notes

• Ensure that the clock inputs (CLK0, CLK1, CLK2) are stable and within the specified frequency range.
• The output signals (OUT0, OUT1, OUT2) can be used to trigger other devices or generate interrupts.
• The chip select (CS), read (RD), and write (WR) signals must be properly controlled to access the registers.

This should provide a comprehensive overview of the CS82C54-10 and how to use it effectively.

(For reference only)