Maxim Integrated MAXQ610 - Manual (Page 96)

6-3
MAXQ610 User’s Guide
All these special functions are disabled by default with the exception of the JTAG interface pins, which are enabled
by default following any reset .
The port pin input/output states can be defined as shown in Table 6-2 .
Table 6-2. MAXQ610 Port Pin Input/Output States
Table 6-1. Port Pin Special Functions (continued)
6.1 Port Pin Register Descriptions
The following peripheral registers are used to control the general-purpose I/O and external interrupt features specific
to the MAXQ610 .
Bits 7:0: Port 0 Output. This register stores the data that is output on any of the pins of port 0 that have been defined
as output pins . If the port pins are in input mode, this register controls the weak pullup enable for each pin . Changing
the data direction of any pins for this port (through register PD0) does not affect the value in this register .
Bits 7:0: Port 1 Output. This register stores the data that is output on any of the pins of port 1 that have been defined
as output pins . If the port pins are in input mode, this register controls the weak pullup enable for each pin . Changing
the data direction of any pins for this port (through register PD0) does not affect the value in this register .
PORT PIN DIRECTION SPECIAL FUNCTION ENABLED WHEN
P4 .2 Input/Output — —
P4 .3 Input/Output — —
P4 .4 Input/Output — —
P4 .5 Input/Output — —
PDx.y POx.y PORT PIN MODE PORT PIN (Px.y) STATE
0 0 Input Three-state
0 1 Input Weak pullup HIGH
1 0 Output Strong drive LOW
1 1 Output Strong drive HIGH
Register Name PO0
Register Description Port 0 Output Register
Register Address M0[00h]
Register Name PO1
Register Description Port 1 Output Register
Register Address M0[01h]
Bit # 7 6 5 4 3 2 1 0
Name PO0 .7 PO0 .6 PO0 .5 PO0 .4 PO0 .3 PO0 .2 PO0 .1 PO0 .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 PO1 .7 PO1 .6 PO1 .5 PO1 .4 PO1 .3 PO1 .2 PO1 .1 PO1 .0
Reset s s s s s s s s
Access rw rw rw rw rw rw rw rw