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參數(shù)資料
| 型號： | PCI24 |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數(shù)： | 6/14頁 |
| 文件大小： | 178K |
| 代理商： | PCI24 |
&21752/ 6<67(06
J223 PCI24
2192-10422-000-000
Page 6
Counter/Timers
Counter/timer 0 and 1 are cascaded to form a programmable timebase generator. The input
clock to CT1 is 4MHz and its output is used as the input clock to CT0 whose output can be
used to generate an interrupt. CT2’s clock comes from the D connector via the group 2 opto-
isolator and its output can also generate and interrupt.
I/O map
The value written to the pointer register is used to select the on-board I/O location to be
accessed. This board occupies two consecutive addresses and has 7 I/O function registers
and two special registers.
The board must be set on an even address boundary.
Address
Read/Write
Write only
Read/Write
Register Name
Pointer register
Data Register
Register Function
On-board register
Data
to
from/to register
Base (180)
Base+1 (181)
read/write
I/O Function Registers
Pointer value
Register name
Read/Write
Read
Read
Read
Read/Write
Read/Write
Read/Write
Write
Register Description
Group 0 inputs
Group 1 inputs
Group 2 inputs
Counter 0
Counter 1
Counter 2
Counter/timer control
00
01
02
10
11
12
13
G0
G1
G2
CT0
CT1
CT2
Control
Special Function Registers
The green User LED is controlled by bit 0 when the pointer register is loaded with 80h. The
board identification register can be used to confirm the board is present in the system and is
the correct board type. Other Pcbus I/O boards in Arcom’s range will return a different value.
Pointer Value
80
Register Name
User LED
Read/Write
Write
Comments
Writing 01 switches the green
LED on. Writing 00 switches it off.
Page 6 Reading this register
gives the value 08.
81
Board ident
Read
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| PCI-24 | 制造商:Pan Pacific 功能描述: |
| PCI-28 | 制造商:Pan Pacific 功能描述: |
| PC-I2C-DEV | 功能描述:界面開發(fā)工具 I2C Software Development Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
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