vt82c586a ETC-unknow, vt82c586a Datasheet - Page 27

• Manufacturer Part Number: vt82c586a
• Description: Integrated Peripheral Controller
• Manufacturer: ETC-unknow

Timer / Counter Registers
Ports 40-43 - Timer / Counter Registers
There are 4 Timer / Counter registers:
I/O Address Bits 15-0
0000 0000 010x xx00
0000 0000 010x xx01
0000 0000 010x xx10
0000 0000 010x xx11
Note that not all bits of the address are decoded.
The Timer / Counters are compatible with the Intel 8254
Timer / Counter chip. Detailed descriptions of 8254 Timer /
Counter operation can be obtained from the Intel Peripheral
Components Data Book and numerous other industry
publications.
Preliminary Revision 0.1 October 13, 1996

Register Name
Timer / Counter 0 Count
Timer / Counter 1 Count
Timer / Counter 2 Count
Timer / Counter Cmd Mode
WO
RW
RW
RW
-21-
CMOS / RTC Registers
Port 70 - CMOS Address ................................................. WO
Port 71 - CMOS Data ....................................................... RW
Note:
6-0
7-0
7
NMI Disable ........................................................ WO
CMOS Address (128 bytes) ................................ WO
CMOS Data (128 bytes)
The system Real Time Clock (RTC) is part of the
“CMOS” block.
located at specific offsets in the CMOS data area.
Detailed descriptions of CMOS / RTC operation and
programming can be obtained from the VIA
VT82887 Data Book or numerous other industry
publications.
0
1
Enable NMI Generation. NMI is asserted on
encountering IOCHCK# on the ISA bus or
SERR# on the PCI bus.
Disable NMI Generation........................ default
The RTC
Register Descriptions
control registers are
VT82C586A