Specifications

Élan™SC310 Microcontroller Data Sheet 25
PRELIMINARY
Notes:
1. These outputs function as open-drain outputs in Normal Parallel Port mode, and function as CMOS drivers when the EPP-
MODE configuration bit is set.
2. The parallel port interface BUSY input must have an external pullup if the parallel port is to be used in EPP mode. If this pullup
is not present, accesses to the parallel port in EPP mode will lock up the system.
All inputs that have VCC clamp = 5 V are 5-V safe inputs regardless of their VCCIO.
Notes:
1. These pins are terminated externally per bus option selection.
All inputs that have VCC clamp = 5 V are 5-V safe inputs regardless of their VCCIO.
Table 5. Parallel Port Interface
Signal Name Pin No.
I/O
Type
Term
Drive
Type
Clock
Off
Reset State
(volts)
VCCIO
VCC
Clamp
Spec.
Load
(pF)
Local
Bus
Max
ISA
AFDT
[X14OUT]
1
80 O —DLast
state
5.0 5.0 VCC5 VCC5 100
INIT
1
89 O — D Last
state
0.0 0.0 VCC5 VCC5 100
STRB
1
83 O — D Last
state
5.0 5.0 VCC5 VCC5 100
SLCTIN
1
84 O — D Last
state
5.0 5.0 VCC5 VCC5 100
ACK
88 I — — — 5.0 5.0 VCC5 VCC5 —
BUSY
2
85 I — — — 5.0 5.0 VCC5 VCC5 —
ERROR
86 I — — — 5.0 5.0 VCC5 VCC5 —
PE 82 I — — — 5.0 5.0 VCC5 VCC5 —
SLCT 87 I — — — 5.0 5.0 VCC5 VCC5 —
PPDWE
[PPDCS] 90 O — B 1(1) 5.0 5.0 VCC5 VCC5 30
PPOEN
91 O — B 1(1) 0.0 0.0 VCC5 VCC5 30
Table 6. Serial Port Interface
Signal Name Pin No.
I/O
Type
Term
Drive
Type
Clock
Off
Reset State
(volts)
VCCIO
VCC
Clamp
Spec.
Load
(pF)
Local
Bus
Max
ISA
DTR
/CFG1
1
92 O — A Last state 5.0 0 VCC5 VCC5 50
RTS/CFG0
1
93 O — A Last state 0.0 5.0 VCC5 VCC5 50
SOUT 94 O — A Last state 0.0 5.0 VCC5 VCC5 50
CTS 96 I PU — — 5.0 5.0 VCC5 VCC5 —
DCD
98 I PU — — 5.0 5.0 VCC5 VCC5 —
DSR
97 I PU — — 5.0 5.0 VCC5 VCC5 —
RIN
100 I PU — — 5.0 5.0 VCC5 VCC5 —
SIN 99 I PU — — 5.0 5.0 VCC5 VCC5 —