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MC9S12VR-Family - Data Sheet - Freescale Semiconductor

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110K / 550K<br />

PIRL=0 / PIRL=1<br />

HV Supply<br />

500K<br />

40K<br />

VDDX<br />

Figure 2-48. Digital Input Read with Pullup Enabled<br />

<strong>MC9S12VR</strong> <strong>Family</strong> Reference Manual, Rev. 2.8<br />

Port Integration Module (S12VRPIMV2)<br />

External pullup device (Figure 2-49):<br />

1. Enable analog function on HVIx in non-direct mode (PTAL[PTAENL]=1, PTAL[PTADIRL]=0,<br />

PTAL[PTAL1:PTAL0]=x, where x is 0, 1, 2, or 3)<br />

2. Select internal pulldown device on selected HVI (PTAL[PTPSL]=0)<br />

3. Enable function to force input buffer active on selected HVI in analog mode (PTAL[PTTEL]=1)<br />

4. Verify PTILx=1 for a connected external pullup device; read PTILx=0 for an open input<br />

PIRL=0 / PIRL=1<br />

10K<br />

40K<br />

610K / 1050K<br />

Figure 2-49. Digital Input Read with Pulldown Enabled<br />

<strong>Freescale</strong> <strong>Semiconductor</strong> 99<br />

HVIx<br />

HV Supply<br />

10K<br />

min. 1/10 * V DDX<br />

HVIx<br />

Digital in<br />

max. 10/11 * VHVI (PIRL=0)<br />

max. 21/22 * VHVI (PIRL=1)<br />

Digital in

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