![](http://datasheet.mmic.net.cn/30000/MC68322FT16_datasheet_2368702/MC68322FT16_106.png)
Parallel Port Interface
MOTOROLA
MC68322 USER’S MANUAL
9-7
IVD—Invalid Transition
This bit is set when SELECTIN transitions from high to low in the middle of an ECP forward
data transfer handshake sequence. The invalid transition interrupt is posted if SELECTIN is
low when STROBE is low or BUSY is high. This event can be posted only when ECP is
enabled.
CRD—Command Received
This bit is set when a command byte is latched into the PPIR’s DATA field. If ECP without
RLE (MODE = 10
2) is enabled, then a command received interrupt is posted when a run-
length or channel address is received. If ECP with RLE (MODE = 11
2) is enabled, then a
command received interrupt is posted when a channel address is received. This event can
only be posted when ECP is enabled.
DRD—Data Received
This bit is set when data is latched into the PPIR’s DATA field, which occurs on every high
to low transition of STROBE when the PPCR’s PDE bit is clear. This interrupt is also set if
ECP with RLE (MODE = 11
2) is enabled and data decompression is in progress.
INL—INIT Low
This bit is set when a high-to-low transition on INIT is reported in the PPIR.
INH—INIT High
This bit is set when a low-to-high transition on INIT is reported in the PPIR.
AFL—AUTOFD Low
This bit is set when a high-to-low transition on AUTOFD is reported in the PPIR.
AFH—AUTOFD High
This bit is set when a low-to-high transition on AUTOFD is reported in the PPIR.
STL—STROBE Low
This bit is set when a high-to-low transition on STROBE is reported in the PPIR.
STH—STROBE High
This bit is set when a low-to-high transition on STROBE is reported in the PPIR.
SNL—SELECTIN Low
This bit is set when a high-to-low transition on SELECTIN is reported in the PPIR.
SNH—SELECTIN High
This bit is set when a low-to-high transition on SELECTIN is reported in the PPIR.
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.