Port SIO configuration register
| VREG_EN01 | The regulated output mode is selected ONLY if the CFG.DRIVE_MODE bits are set to the strong pull up (Z_1 = ‘5’) mode If the CFG.DRIVE_MODE bits are set to any other mode the regulated output buffer will be disabled and the standard CMOS output buffer is used. |
| IBUF_SEL01 | N/A |
| VTRIP_SEL01 | N/A |
| VREF_SEL01 | N/A |
| VOH_SEL01 | Selects trip-point of input buffer. In single ended input buffer mode (IBUF01_SEL = ‘0’): 0: input buffer functions as a CMOS input buffer. 1: input buffer functions as a LVTTL input buffer. In differential input buffer mode (IBUF01_SEL = ‘1’): VTRIP_SEL=0: a) VREF_SEL=00, VOH_SEL=X -> Trip point=50 percent of vddio b) VREF_SEL=01, VOH_SEL=000 -> Trip point=Vohref (buffered) c) VREF_SEL=01, VOH_SEL=[1-7] -> Input buffer functions as CMOS input buffer. d) VREF_SEL=10/11, VOH_SEL=000 -> Trip_point=Amuxbus_a/b (buffered) e) VREF_SEL=10/11, VOH_SEL=[1-7] -> Input buffer functions as CMOS input buffer. VTRIP_SEL=1: a) VREF_SEL=00, VOH_SEL=X -> Trip point=40 percent of vddio b) VREF_SEL=01, VOH_SEL=000 -> Trip point=0.5Vohref c) VREF_SEL=01, VOH_SEL=[1-7] -> Input buffer functions as LVTTL input buffer. d) VREF_SEL=10/11, VOH_SEL=000 -> Trip_point=0.5Amuxbus_a/b (buffered) e) VREF_SEL=10/11, VOH_SEL=[1-7] -> Input buffer functions as LVTTL input buffer. |
| VREG_EN23 | N/A |
| IBUF_SEL23 | N/A |
| VTRIP_SEL23 | N/A |
| VREF_SEL23 | N/A |
| VOH_SEL23 | N/A |
| VREG_EN45 | N/A |
| IBUF_SEL45 | N/A |
| VTRIP_SEL45 | N/A |
| VREF_SEL45 | N/A |
| VOH_SEL45 | N/A |
| VREG_EN67 | N/A |
| IBUF_SEL67 | N/A |
| VTRIP_SEL67 | N/A |
| VREF_SEL67 | N/A |
| VOH_SEL67 | N/A |