ZLP12840 datasheet(26/58 Pages) ZILOG

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PS024406-0106

P R E L I M I N A R Y

Port 3

ZLP12840 OTP MCU

Product Specification

P31 can be used as an interrupt, analog comparator input, infrared learning amplifier

input, normal digital input pin and as a stop-mode recovery source. When bit 2 of the Port

3 Mode Register (P3M) is set, P31 is used as the infrared learning amplifier, IR1. The ref-

erence source for IR1 is GND. The infrared learning amplifier is disabled during STOP

mode. When bit 1 of P3M is set, the part is in ANALOG mode and the analog comparator,

COMP1 is used. The reference voltage for COMP1 is P30 (PREF1). When in ANALOG

mode, P30 cannot be read as a digital input when the CPU reads bit 0 of the Port 3 Regis-

Figure 6. Port 3 Configuration

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