3 i/o port: type c, 4 i/o port: type d, 3 i/o port: type c -3 – Maxim Integrated MAXQ Family User Manual
Page 60: 4 i/o port: type d -3, Figure 6-3. type c port pin schematic -3, Figure 6-4. type d port pin schematic -3, Table 6-1. weak pullup control -3, Maxq family user’s guide
6.3 I/O Port: Type C
The Type C I/O port is nearly identical to the Type B I/O port, but with the addition of a selectable internal, weak, P-channel, pullup
device. The weak pullup device can be enabled by configuring the port pin as an input and setting the associated port output bit to
logic 1 (default reset state).
6-3
MAXQ Family User’s Guide
PD.x
SF ENABLE
PO.x
PI.x OR SF INPUT
SF OUTPUT
SF DIRECTION
Vdd
I/O PAD
MUX
MUX
PIN.x
Vdd
WEAK
MAXQ
Figure 6-3. Type C Port Pin Schematic
PDX.x (PORT DIRECTION BIT) OR
SF SELECT (SF I/O CONTROL)
POX.x (PORT OUTPUT
BIT)
WEAK PULLUP
X
0
OFF
1 = output
1
OFF
0 = input
1
ON
Table 6-1. Weak Pullup Control
6.4 I/O Port: Type D
The Type D I/O port merges the Type C I/O port with the interrupt functionality of the Type A I/O port. Just like the Type C I/O port, the weak
pullup device can be enabled by configuring the port pin as an input and setting the associated port output bit to logic 1 (default reset state).
PD.x
SF ENABLE
PO.x
PI.x OR SF INPUT
SF OUTPUT
SF DIRECTION
Vdd
I/O PAD
MUX
MUX
PIN.x
Vdd
WEAK
MAXQ
FLAG
EIE.x
DETECT
CIRCUIT
INTERRUPT
FLAG
Figure 6-4. Type D Port Pin Schematic
Maxim Integrated