Maxim Integrated MAXQ Family Users Guide: MAXQ2000 Supplement - Manual (Page 33)

MAXQ Family User’s Guide:
MAXQ2000 Supplement
ADDENDUM TO SECTION 6: GENERAL-PURPOSE I/O MODULE
(GPIO AND EXTERNAL INTERRUPTS)
The MAXQ2000 provides 50 port pins (in the 68-pin package) or 38 port pins (in the 56-pin package) for general-purpose I/O, which
are grouped into logical ports P0 through P7. Each of these port pins has the following features.
• CMOS output drivers
• Schmitt trigger inputs
• Optional weak pullup to V DDIO when operating in input mode
Port pins P6.4, P6.5, P7.0, and P7.1 may be configured to operate at a voltage level given by V LCD instead of V DDIO by setting bits in
the SVS register.
Many of the port pins on the MAXQ2000 are also multiplexed with special functions as listed below. All of these special functions are
disabled by default with the exception of the JTAG interface pins, which are enabled by default following any reset.
PORT PIN TYPE SPECIAL FUNCTION ENABLED WHEN
P0.0 Analog LCD Segment SEG0 PCF0=1 and OPM=1
P0.1 Analog LCD Segment SEG1 PCF0=1 and OPM=1
P0.2 Analog LCD Segment SEG2 PCF0=1 and OPM=1
P0.3 Analog LCD Segment SEG3 PCF0=1 and OPM=1
P0.4 Analog LCD Segment SEG4 PCF0=1 and OPM=1
P0.4 Input External Interrupt 0 EX0=1
P0.5 Analog LCD Segment SEG5 PCF0=1 and OPM=1
P0.5 Input External Interrupt 1 EX1=1
P0.6 Analog LCD Segment SEG6 PCF0=1 and OPM=1
P0.6 Input External Interrupt 2 EX2=1
P0.7 Analog LCD Segment SEG7 PCF0=1 and OPM=1
P0.7 Input External Interrupt 3 EX3=1
P1.0 Analog LCD segment SEG8 PCF1=1 and OPM=1
P1.1 Analog LCD segment SEG9 PCF1=1 and OPM=1
P1.2 Analog LCD segment SEG10 PCF1=1 and OPM=1
P1.3 Analog LCD Segment SEG11 PCF1=1 and OPM=1
P1.4 Analog LCD Segment SEG12 PCF1=1 and OPM=1
P1.5 Analog LCD Segment SEG13 PCF1=1 and OPM=1
P1.6 Analog LCD Segment SEG14 PCF1=1 and OPM=1
P1.7 Analog LCD Segment SEG15 PCF1=1 and OPM=1
P2.0 Analog LCD Segment SEG16 PCF2=1 and OPM=1
P2.1 Analog LCD Segment SEG17 PCF2=1 and OPM=1
P2.2 Analog LCD Segment SEG18 PCF2=1 and OPM=1
P2.3 Analog LCD Segment SEG19 PCF2=1 and OPM=1
P2.4 Analog LCD Segment SEG20 PCF2=1 and OPM=1
P2.5 Analog LCD Segment SEG21 PCF2=1 and OPM=1
P2.6 Analog LCD Segment SEG22 PCF2=1 and OPM=1
P2.7 Analog LCD Segment SEG23 PCF2=1 and OPM=1
P3.0 Analog LCD Segment SEG24 PCF3=1 and OPM=1
Table 10. Port Pin Special Functions (68-Pin Package)
Maxim Integrated 33