CD1284 Datasheet, PDF (27/176 Pages) Intel Corporation – IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports

IEEE 1284-Compatible Parallel Interface Controller — CD1284
Table 7. Channel Registers — Parallel Port
(Selected by Channel 0 in CAR) (Sheet 2 of 2)
Name Hex
SPR
26
SSR
2F
ZDR
2C
Bit 7
0
0
Bit 6
0
0
Bit 5
0
0
Bit 4
Bit 3
8-Bit Binary Value
0
A1284
0
A1284
Bit 2
nInit
nInit
Bit 1
HstBsy
HstBsy
Bit 0
HstClk
HstClk
Page
153
154
154
4.2
Register Usage
Table 8 through Table 13 present register tunctionality.
Table 8. Global Registers
Name
Reset Parallel Init Parallel Tx Parallel Rx Serial Init Serial Tx Serial Rx
CAR
√
√
√
√
√
GFRCR
√
GPDIR
GPIO
MICR
√
MIR
PIR
√
√
PPR
√
RICR
√
RIR
SVRR
TICR
√
TIR
Table 9. Virtual Registers
Name
MISR
MIVR
PIVR
RDSR (data)
RDSR
(status)
RIVR
TDR
TIVR
Reset
Parallel Init
Parallel Tx
√
Parallel Rx
√
√
√
√
√
√
√
Serial Init
√
√
√
√
√
Serial Tx
√
√
√
√
GPIO Pin
Control
√
√
√
Serial Rx
√
√
√
√
√
Datasheet
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