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Table A-6. 83C196LD Default Signal Conditions
Port
Alternate
Signals
Functions
P0.7:2
—
P1.0
EPA0/T2CLK
P1.1
EPA1
P1.2
EPA2/T2DIR
P1.3
EPA3
P2.0
TXD
P2.1
RXD
P2.2
EXTINT
P2.4
—
P2.6
ONCE
P2.7
CLKOUT
P3.7:0
AD7:0
P4.7:0
AD15:8
P5.0
ALE/ADV#
P5.2
WR#/WRL#
P5.3
RD#
P6.0
EPA8
P6.1
EPA9
P6.4
SC0
P6.5
SD0
P6.6
SC1
P6.7
SD1
—
EA#
—
RESET#
—
V
PP
—
XTAL1
—
XTAL2
NOTES:
1.
If P x _MODE. y = 0, port is as programmed.
If P x _MODE. y = 1, pin is as specified by P x _DIR and the associated peripheral.
2.
If P2_MODE.7 = 0, pin is as programmed. If P2_MODE.7 = 1, pin is LoZ0.
3.
If XTAL1 = 0, pin is LoZ1. If XTAL1 = 1, pin is LoZ0.
4.
If EA# = 0, port is HiZ. If EA# = 1, port is open-drain I/O.
5.
Although EA# is weakly pulled high, do not allow it to float. Always tie EA# to V
to an external device.
6.
The values in this column are valid until your software writes to P x _MODE.
Upon RESET#
During RESET#
Inactive
Active
(Note 6)
HiZ
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
MD1
MD1
CLKOUT active,
CLKOUT active,
LoZ0/1
LoZ0/1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1 (Note 5)
WK1
LoZ0
MD1
HiZ
Osc input, HiZ
Osc input, HiZ
Osc output,
Osc output,
LoZ0/1
LoZ0/1
SIGNAL DESCRIPTIONS
Idle
HiZ
HiZ
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
HiZ
(Note 4)
HiZ
(Note 4)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
WK1
MD1
HiZ
LoZ1
Osc input,
HiZ
Osc output,
LoZ0/1
if it is not connected
CC
Power-
down
HiZ
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 2)
(Note 4)
(Note 4)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
WK1
MD1
LoZ1
Osc input,
HiZ
(Note 3)
A-9
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