1 port pin example 1: driving outputs on port 0, 2 port pin example 2: receiving inputs on port 1 – Maxim Integrated MAXQ622 User Manual
Page 111
MAXQ612/MAXQ622 User’s Guide
Maxim Integrated
6-9
Bits 5:0: Input/Output Direction for Port 5. The bits in this register control the input/output direction for port pins P5 .0
to P5 .7 . When PD5 .n is set to 0, the corresponding port pin (P5 .n) acts as an input with characteristics determined by
PO5 .n . When PD5 .n is set to 1, the port pin acts as an output, driving the output state given by PO5 .n .
Bits 7:0: Input/Output Direction for Port 6. The bits in this register control the input/output direction for port pins P6 .0
to P6 .7 . When PD6 .n is set to 0, the corresponding port pin (P6 .n) acts as an input with characteristics determined by
PO6 .n . When PD6 .n is set to 1, the port pin acts as an output, driving the output state given by PO6 .n .
6.1.1 Port Pin Example 1: Driving Outputs on Port 0
move PO0, #000h ; Set all outputs low
move PD0, #0FFh ; Set all P0 pins to output mode
6.1.2 Port Pin Example 2: Receiving Inputs on Port 1
move PO1, #0FFh ; Set weak pullups ON on all pins
move PD1, #000h ; Set all P1 pins to input mode
nop
; Wait for external source to drive P1 pins
move Acc, PI1
; Get input values from P1 (will return FF if
; no other source drives the pins low)
Register Name
PD5
Register Description
Port 5 Direction Register
Register Address
M1[11h]
Register Name
PD6
Register Description
Port 6 Direction Register
Register Address
M1[12h]
Bit #
7
6
5
4
3
2
1
0
Name
PD5 .7
PD5 .6
PD5 .5
PD5 .4
PD5 .3
PD5 .2
PD5 .1
PD5 .0
Reset
s
s
s
s
s
s
s
s
Access
rw
rw
rw
rw
rw
rw
rw
rw
Bit #
7
6
5
4
3
2
1
0
Name
PD6 .7
PD6 .6
PD6 .5
PD6 .4
PD6 .3
PD6 .2
PD6 .1
PD6 .0
Reset
s
s
s
s
s
s
s
s
Access
rw
rw
rw
rw
rw
rw
rw
rw