Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Bedienungsanleitung PDF herunterladen (Seite 34)

MAXQ Family User’s Guide:

MAXQ8913 Supplement

6-2

Table 6-1. Port Pin Special and Alternate Functions (continued)

The port pins on the MAXQ8913 operate the same as standard MAXQ port pins, with input/output states defined in

Table 6-2. Refer to the IC data sheet for specific voltage and current characteristics of port pins in input or output mode.

The port pins P0[7:0] on the MAXQ8913 have an additional operating mode available that allows the Schmitt input

triggers on individual pins to be enabled or disabled. When PID0.x is set to 1, the corresponding input bit PI0.x always

reads 0, regardless of the logic level that is currently present at the pin. When PID0.x is set to 0, the input bit PI0.x

operates normally.

Table 6-2. P1[3:0] Input/Output States (in Standard Mode)

Table 6-3. P0[7:0] Input/Output States (in Standard Mode)

PORT PIN FUNCTION TYPE FUNCTION ENABLED WHEN

P1.1 Special Serial Port 0 Transmit/Clock

Mode 0: REN set to 1 (until serial transmis-

sion completes)

Mode 1/2/3: SBUF is written (until serial

transmission completes)

P1.1 Special SDA—I

C Data Line I2CEN = 1 (overrides serial port Tx)

P1.2 Alternate External Interrupt 10 (EIE1.2) EX10 = 1

P1.2 Alternate Type B Timer 0 Input A (Counter Input) C/TB = 1

P1.2 Special Type B Timer 0 Output A (Clock Output) C/TB = 0 and TB0E = 1

P1.3 Alternate External Interrupt 11 (EIE1.3) EX11 = 1

P1.3 Alternate Type B Timer 0 Input B EXENB = 1

P1.3 Special Type B Timer 0 Output B (Compare Output) TBCR:TBCS<>00b

PD1.y PO1.y PORT PIN MODE PORT PIN (Px.y) STATE PI1.x READ VALUE

0 0 Input Three-State Depends on external sigal

0 1 Input Weak pullup high 1 (unless overdriven externally)

1 0 Output Strong drive low 0 (unless overdriven externally)

1 1 Output Strong drive high 1 (unless overdriven externally)

PD0.x PO0.x PID0.x PORT PIN MODE PORT PIN (Px.y) STATE PI0.x READ VALUE

0 0 0 Input Three-State Depends on external signal

0 0 1 No function Three-State 0

0 1 0 Input Weak pullup high 1 (unless overdriven externally)

0 1 1 Weak pullup Weak pullup High 0

1 0 0 Output Strong drive low 0 (unless overdriven externally)

1 0 1 Output Strong drive low 0

1 1 0 Output Strong drive high 1 (unless overdriven externally)

1 1 1 Output Strong drive high 0

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Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Bedienungsanleitung Seite 34