MAXQ612/MAXQ622 User’s Guide
6-2 Maxim Integrated
SECTION 6: GENERAL-PURPOSE I/O MODULE
The MAXQ612/MAXQ622 provide 38 port pins for general-purpose I/O that are grouped into eight port pins on port 0
to port 3 and six port pins on port 4. Each of these port pins has the following features:
• CMOS output drivers
• Schmitt trigger inputs
• Optional weak pullup to V
DD
when operating in input mode
From a software perspective, each port appears as a group of peripheral registers with unique addresses. Special
function pins can also be used as general-purpose IO pins when the special functions are disabled (ports 2 and 3).
Table 6-1. Port Pin Special Functions
PORT PIN DIRECTION SPECIAL FUNCTION ENABLED WHEN
P0.0 Input/Output IR modulator/envelope output (IRTXM) IRENV[1:0] = 01b or 10b
P0.1 Input/Output Serial USART 0 Receive (RX0) REN = 1
P0.2 Input/Output Serial USART 0 Transmit (TX0) SBUF0 written
P0.3 Input/Output Serial USART 1 Receive (RX1) REN = 1
P0.4 Input/Output Serial USART 1 Transmit (TX1) SBUF1 written
P0.5 Input/Output Timer 0 Input (TBA0)/Timer 1 Input (TBA1) C/TB = 1 or TBOE = 1
P0.6 Input/Output Timer 0 PWM Output (TBB0) EXENB = 1 or TBCR:TBCS ≠ 00b
P0.7 Input/Output Timer 1 PWM Output (TBB1) EXENB = 1 or TBCR:TBCS ≠ 00b
P1.0 Input/Output External Interrupt 0 (INT0) EX0 = 1
P1.1 Input/Output External Interrupt 1 (INT1) EX1 = 1
P1.2 Input/Output External Interrupt 2 (INT2) EX2 = 1
P1.3 Input/Output External Interrupt 3 (INT3) EX3 = 1
P1.4 Input/Output External Interrupt 4 (INT4) EX4 = 1
P1.5 Input/Output External Interrupt 5 (INT5) EX5 = 1
P1.6 Input/Output External Interrupt 6 (INT6) EX6 = 1
P1.7 Input/Output External Interrupt 7 (INT7) EX7 = 1
P2.0 Input/Output SPI 0 Master Out-Slave In (MOSI0) SPIEN0 = 1
P2.1 Input/Output SPI 0 Master In-Slave Out (MISO0) SPIEN0 = 1
P2.2 Input/Output SPI 0 Slave Clock (SCLK0) SPIEN0 = 1
P2.3 Input/Output
SPI 0 Slave Select (SSEL0)
SPIEN0 = 1
P2.4 Input/Output JTAG interface—TAP Clock (TCK) (SC.7) TAP =
P2.5 Input/Output JTAG interface—TAP Data Input (TDI) (SC.7) TAP= 1
P2.6 Input/Output JTAG interface—TAP Mode Select (TMS) (SC.7) TAP = 1
P2.7 Input/Output JTAG interface—TAP Data Output (TDO) (SC.7) TAP = 1
P3.0 Input/Output External Interrupt 8 (INT8) EX8 = 1
P3.1 Input/Output External Interrupt 9 (INT9) EX9 = 1
P3.2 Input/Output External Interrupt 10 (INT10) EX10 = 1
P3.3 Input/Output External Interrupt 11 (INT11) EX11 = 1
P3.4 Input/Output External Interrupt 12 (INT12) EX12 = 1
P3.5 Input/Output External Interrupt 13 (INT13) EX13 = 1
P3.6 Input/Output External Interrupt 14 (INT14) EX14 = 1
P3.7 Input/Output External Interrupt 15 (INT15) EX15 = 1
P4.0 Input/Output — —
P4.1 Input/Output — —
(93 Seiten)
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