Multiplexed
Pins
With
P4.7:0
AD15:8
P5.0
ALE/ADV#
P5.2
WR#/WRL#
P5.3
RD#
P5.4
—
P5.5
BHE#/WRH#
P5.6
READY
P6.0
EPA8/COMP0
P6.1
EPA9/COMP1
P6.4
SC0
P6.5
SD0
P6.6
SC1
P6.7
SD1
EA#
—
NMI
—
RESET#
—
RXCAN
—
TXCAN
—
V
—
PP
XTAL1
—
XTAL2
—
NOTES:
If P5_MODE. x = 0, port is as programmed.
1.
If P5_MODE. x = 1 and HLDA# = 1, P5.0 and P5.1 are LoZ0; P5.5 is LoZ1.
If P5_MODE. x = 1 and HLDA# = 0, port is HiZ.
If P5_MODE. x = 0, port is as programmed. If P5_MODE. x = 1, port is HiZ.
2.
If P x _MODE. x = 0, port is as programmed.
3.
If P x _MODE. x = 1, pin is as specified by P x _DIR and the associated peripheral.
4.
If P2_MODE.7 = 0, pin is as programmed. If P2_MODE.7 = 1, pin is LoZ0.
5.
If XTAL1 = 0, pin is LoZ1. If XTAL1 = 1, pin is LoZ0.
6.
If EA# = 0, port is HiZ. If EA# = 1, port is open-drain I/O.
7.
If CAN_MSG x CON1.5:4 = 01, TXCAN is LoZ1.
If CAN_MSG x CON1.5:4 = 10, TXCAN is transmitting information.
8.
Although these signals are weakly pulled high or low, do not allow them to float. Always tie these sig-
nals to their inactive state (V
9.
The values in this column are valid until user code configures the specific signal (i.e., until P x _MODE
is written).
Table B-10. 87C196CA Pin Status (Continued)
During RESET#
Active
WK1
WK1
WK1
WK1
MD1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1
WK1 (Note 8)
WK0 (Note 8)
LoZ0
WK1
LoZ1
HiZ
Osc input, HiZ
Osc output,
LoZ0/1
or V
) if they are not connected to an external device.
CC
SS
SIGNAL DESCRIPTIONS
Upon RESET#
Inactive (Note 9)
HiZ
(Note 6)
WK1
(Note 1)
WK1
(Note 3)
WK1
(Note 3)
MD1
(Note 3)
WK1
(Note 1)
WK1
(Note 2)
WK1
(Note 3)
WK1
(Note 3)
WK1
(Note 3)
WK1
(Note 3)
WK1
(Note 3)
WK1
(Note 3)
WK1
WK1
WK0
WK0
MD1
MD1
WK1
WK1
LoZ1
LoZ1
(Note 7)
HiZ
LoZ1
Osc input,
Osc input, HiZ
Osc output,
Osc output,
LoZ0/1
LoZ0/1
Idle
Power-down
(Note 6)
(Note 1)
(Note 3)
(Note 3)
(Note 3)
(Note 1)
(Note 2)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
WK1
WK0
MD1
WK1
LoZ1
LoZ1
Osc input,
HiZ
HiZ
(Note 5)
B-23