Figure 2.9 I/O signals (5 of 5)
Pin
Name
Pin
Number
I/O
Description
DC Characteristics
Driver or Receiver Re
quirements o f each
Peripheral
EOP / a11
I/O
End o f Process-EOP signals that DM A service has
been completed. Also inp ut active low.
For details 8237A-5 Spec.
Receiver: 11_<-0.4mA
lH < 2 0u A
only fo r 3 Peripherals
Driver open C ollector
I |_>5mA
IFSELO/ c28 0 Interface select 0 to 4, active low.
Receiver:
IFSE L1/ a28 0 The Interface does not need own address
decoder.
I l < -0.8m A
Ih < 4 0 uA
IFSE L2/ c27 0
The Select o f the I/O ports in the peripherals
IFSE L3/ a27 0 is made by any IFSEL and BA3 (BA 3/).
IFSEL4/ c12 0 (10 Peripherals). A utom atic change o f the data
bus direction. This change is not possible while
a DM A fu nction is being performed.
A U T O /
a13
Change peripheral from board type 1 to board
type 2. N ot connected on board type 1.
Receiver: l|_< 1.2m A
I h < 60/uA
Pull-up resistor
1-10 Kohm to +5V
2 - 1 5
SYSTEM TECHNICAL MANUAL HARDWARE DESCRIPTION
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