參數(shù)資料
型號(hào): CD1283
廠商: Intel Corp.
英文描述: IEEE 1284-Compatible Parallel Interface
中文描述: 符合IEEE 1284兼容并行接口
文件頁數(shù): 51/94頁
文件大小: 1237K
代理商: CD1283
IEEE 1284-Compatible Parallel Interface
CD1283
Datasheet
51
6.3
ASCII Code Tables
Figure 16. Polling Flow Chart
Table 8.
Hexadecimal
Character
(Sheet 1 of 2)
00
NUL
01
SOH
02
STX
03
ETX
04
EOT
05
ENQ
06
ACK
07
BEL
08
BS
09
HT
0A
NL
0B
VT
0C
NP
0D
CR
0E
SO
0F
SI
10
DLE
11
DC1
12
DC2
13
DC3
14
DC4
15
NAK
16
SYN
17
ETB
18
CAN
19
EM
1A
SUB
1B
ESC
1C
FS
1D
GS
1E
RS
1F
US
20
SP
21
!
22
23
#
24
$
25
%
26
&
27
HARDWARE RESET
TEST
SVRR
SERVICE NEGOTIATION
CHANGE
SET
SOFTWARE RESET
INITIALIZE DEVICE
TEST
PIR
TEST
PFSR
SERVICE DMA REQUEST
DMAREQ
POLL DEVICE AGAIN
SERVICE
SIGNAL
CHANGE
INTERRUPT
SVC.
FIFO
CHANGE DIRECTION
RETURN ID TO HOST
RESET PRINTER
TEST
PCISR
TEST
NSR
TEST
SSR
TEST
PFSR
TEST
HRSR
= 00H
SRP SET
= 00H
Pipeline SET
PPort SET
DirCh
IDReq
nNT
NegCh SET
DataErr
SERVICE
ERROR
INTERRUPT
SERVICE
APPROPRIATE
HOLDING
REGISTER
OR
FF FULL
EMPTY
OR
HR DATA
HR TAG
POLL DEVICE AGAIN
SigCh
NOTE:
It may not be necessary to poll the PFSR if
DMA requests are enabled. With DMA
requests enabled, the DMAREQ bit
(SVRR[7]) can be polled to determine when a
FIFO threshold is exceeded. If DMA requests
are disabled, the PFSR register must be
polled to determine when to move data to and
from the FIFO. If DMA requests are enabled,
data must be read through the DMABUF
register; this requires a 16-bit data bus.
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