CY82C693UB Cypress Semiconductor Corporation., CY82C693UB Datasheet - Page 98

• Manufacturer Part Number: CY82C693UB
• Description: Hypercache Tm / Stand-alone Pci Peripheral Controller With Usb
• Manufacturer: Cypress Semiconductor Corporation.

CY82C693UB Timer/Counter Registers
The CY82C693UB contains a timer/counter which can be
used to generate a speaker tone, periodic interrupts, and the
ISA refresh. There are three, individually operated, 16-bit
counters. The output of counter 0 is internally hardwired to the
IRQ0 input of DMA controller 1. The output of counter 1 is tied
to the refresh request logic for ISA refresh. The output of
counter 2 is output on the SPKR (speaker output pin).
Timer/Counter Register 0: Timer Control Word Register (Write Only) - Address=043H
Bit
7:0
Bit
7:6
5:4
3:1
0
Bit
7:6
5
4
3
2
1
0
Timer Control Word Register Format (Not Read-Back Command or Counter Latch Command)
Timer Control Word Register Format (Read-Back Command)
Function
Control Register
Function
Counter Select:
00:
01:
10:
11:
Command)
Read/Write Select:
00:
Latch Command)
01:
10:
11:
Counter Mode Select:
000:
001:
X10:
X11:
100:
101:
Binary/BCD Countdown Select:
0:
1:
Function
Counter Select:
11:
Latch Count of Selected Counter(s) Control:
0:
1:
Latch Status of Selected Counter(s) Control:
0:
1:
Counter 2 Select:
0:
1:
Counter 1 Select:
0:
1:
Counter 0 Select:
0:
1:
Reserved
Counter 0
Counter 1
Counter 2
Read-Back Command (See Timer Control Word Register Format for Read-Back
Counter Latch Command (See Timer Control Word Register Format for Counter-
Read/Write Least Significant Byte of Counter
Read/Write Most Significant Byte of Counter
Read/Write Least Significant Byte followed by Most Significant Byte of Counter
Out signal on end of count=0 cycle.
Hardware re-triggerable one-shot.
Rate Generator (Divide by n counter).
Square Wave Output.
Software triggered strobe.
Hardware triggered strobe.
Binary countdown
BCD countdown
Read-Back Command (Must be 11 for Read-Back Command)
Do not latch current count value
Latch current count value
Do not latch current status value
Latch current status value
Counter 2 not selected
Counter 2 selected
Counter 1 not selected
Counter 1 selected
Counter 0 not selected
Counter 0 selected
PRELIMINARY
98
For proper operation, each counter must be programmed be-
fore use. Each counter is programmed by writing to the “Timer
Control Register” with an appropriate control word and then
writing an initial count to the associated counter’s register. A
count value may be read by reading the associated counter’s
register.
CY82C693UB
Default
00000000
Default
00
00
000
0
Default
11
0
0
0
0
0
0