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參數(shù)資料
| 型號： | PCSER4 |
| 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)： | 4/16頁 |
| 文件大?。?/td> | 285K |
| 代理商： | PCSER4 |
J228 PCSER4
Page 4
2192-09375-000-000
Operation
I/O Map
The I/O Pointer Scheme
To access a register on the PCSER4 you must first set up a pointer to it, by writing a byte to the
'base address' of the PCSER4. After that, you can read from and write to the register that is
pointed to, by accessing the byte at the base address + 1. The base address is set up using
LKA9-LKA1. The board occupies only two bytes on the PCbus I/O space. The base address
must be set to an even location.
In order to allow standardisation of software some register addresses have been defined for all
Arcom PCbus I/O boards. In particular, the top half of the 256 byte space has been defined as
'special function' register space, and the bottom half as 'I/O' register space.
The next two sub-sections describe the register allocations in detail.
The Registers on PCSER4: Table 1 - Indexed I/O Registers
Pointer Value
(hex)
10
Write
Read
Read/Write
Write
Read
Read/Write
Write
Read
Read/Write
Write
Read
Read/Write
Write
Read
INTP
Pulse Interrupt Line
Interrupting Device
Channel 4 Data
Channel 4 Control
Channel 4 Status
Channel 3 Data
Channel 3 Control
Channel 3 Status
Channel 2 Data
Channel 2 Control
Channel 2 Status
Channel 1 Data
Channel 1 Control
Channel 1 Status
INT
not used
D4
C4
S4
D3
C3
S3
D2
C2
S2
D1
C1
S1
10
08-0F
07
06
06
05
04
04
03
02
02
01
00
00
Read/Write
Register Name
Comments
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