Intel 87C196CA, Supplement To User’S Manual

Page: 116 / 136

8XC196L
X SUPPLEMENT
A-8
Table A-5. 87C196LA, LB Default Signal Conditions
Port
Signals
Alternate
Functions
During RESET#
Active
Upon RESET#
Inactive
(Note 6) Idle
Power-
down
P0.7:2 ACH7:2 HiZ HiZ HiZ HiZ
P1.0 EPA0/T2CLK WK0 WK0 (Note 1) (Note 1)
P1.1 EPA1 WK0 WK0 (Note 1) (Note 1)
P1.2 EPA2/T2DIR WK0 WK0 (Note 1) (Note 1)
P1.3 EPA3 WK0 WK0 (Note 1) (Note 1)
P2.0 TXD WK0 WK0 (Note 1) (Note 1)
P2.1 RXD WK0 WK0 (Note 1) (Note 1)
P2.2 EXTINT WK0 WK0 (Note 1) (Note 1)
P2.4 RXJ1850 (LB only) WK0 WK0 (Note 1) (Note 1)
P2.6 ONCE/TXJ1850 (LB only) MD0 MD0 (Note 1) (Note 1)
P2.7 CLKOUT CLKOUT active,
LoZ0/1
CLKOUT active,
LoZ0/1
(Note 1) (Note 2)
P3.7:0 AD7:0 WK0 HiZ (Note 4) (Note 4)
P4.7:0 AD15:8 WK0 HiZ (Note 4) (Note 4)
P5.0 ALE/ADV# WK0 WK0 (Note 1) (Note 1)
P5.2 WR#/WRL# WK0 WK0 (Note 1) (Note 1)
P5.3 RD# WK0 WK0 (Note 1) (Note 1)
P6.0 EPA8/COMP0 WK0 WK0 (Note 1) (Note 1)
P6.1 EPA9/COMP1 WK0 WK0 (Note 1) (Note 1)
P6.4 SC0 WK0 WK0 (Note 1) (Note 1)
P6.5 SD0 WK0 WK0 (Note 1) (Note 1)
P6.6 SC1 WK0 WK0 (Note 1) (Note 1)
P6.7 SD1 WK0 WK0 (Note 1) (Note 1)
— EA# WK1 (Note 5) WK1 WK1 WK1
— RESET# LoZ0 MD1 MD1 MD1
— V
PP
HiZ HiZ LoZ1 LoZ1
— XTAL1
Osc input, HiZ Osc input, HiZ
Osc input,
HiZ
Osc input,
HiZ
— XTAL2 Osc output,
LoZ0/1
Osc output,
LoZ0/1
Osc output,
LoZ0/1
(Note 3)
NOTES:
1.
If P x_MODE.y = 0, port is as programmed.
If P
x_MODE.y = 1, pin is as specified by Px_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
CC
if it is not connected
to an external device.
6. The values in this column are valid until your software writes to P
x_MODE.