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P89LPC913 Datasheet(PDF) 46 Page - NXP Semiconductors |
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P89LPC913 Datasheet(HTML) 46 Page - NXP Semiconductors |
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46 / 66 page  P89LPC912_913_914_5 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 05 — 28 September 2007 46 of 66 NXP Semiconductors P89LPC912/913/914 8-bit microcontrollers with two-clock 80C51 core 8.23 Comparators and power reduction modes Either or both comparators may remain enabled when Power-down or Idle mode is activated, but both comparators are disabled automatically in Total Power-down mode. If a comparator interrupt is enabled (except in Total Power-down mode), a change of the comparator output state will generate an interrupt and wake up the processor. If the comparator output to a pin is enabled, the pin should be configured in the push-pull mode in order to obtain fast switching times while in Power-down mode. The reason is that with the oscillator stopped, the temporary strong pull-up that normally occurs during switching on a quasi-bidirectional port pin does not take place. Comparators consume power in Power-down and Idle modes, as well as in the normal operating mode. This fact should be taken into account when system power consumption is an issue. To minimize power consumption, the user can disable the comparators via PCONA.5, or put the device in Total Power-down mode. 8.24 Keypad interrupt The Keypad Interrupt function is intended primarily to allow a single interrupt to be generated when Port 0 is equal to or not equal to a certain pattern. This function can be used for bus address recognition or keypad recognition. The user can configure the port via SFRs for different tasks. The Keypad Interrupt Mask Register (KBMASK) is used to define which input pins connected to Port 0 can trigger the interrupt. The Keypad Pattern Register (KBPATN) is used to define a pattern that is compared to the value of Port 0. The Keypad Interrupt Flag (KBIF) in the Keypad Interrupt Control Register (KBCON) is set when the condition is matched while the Keypad Interrupt function is active. An interrupt will be generated if enabled. The PATN_SEL bit in the Keypad Interrupt Control Register (KBCON) is used to define equal or not-equal for the comparison. a. CN1, OE1=00 b. CN1, OE1=01 c. CN1, OE1=10 d. CN1, OE1=11 e. CN2=0 f. CN2=1 Fig 22. Comparator configurations CIN1A CMPREF 002aaa490 CO1 CIN1A CMPREF 002aaa491 CMP1 CO1 CIN1A VREF (1.23 V) 002aaa492 CO1 CIN1A VREF (1.23 V) 002aaa493 CMP1 CO1 CIN2A CMPREF 002aaa494 CO2 CIN2A VREF (1.23 V) 002aaa495 CO2 |
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