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NXP Microprocessor P87C557 Protected Flash Cloning can start from changing the mode of comparators, since all comparators are disabled automatically in power down mode, in idle mode unused comparators should be disabled by software to save power. A comparator can generate an interrupt that will terminate idle mode.

The CMPE register contains bits to enable each comparator to drive external output pins or internal PCA capture inputs. Pullups at the output pins are disabled by hardware when the external comparator output is enabled. The comparator output is wire-ORed with the corresponding port SFR bit, so the SFR bit must also be set by software to enable the output of MCU Reading.

When 1s are written to CMPE bits 7-4, the comparator outputs will drive the corresponding capture input. (This function is not available in the idle or power-down mode.) When 1s are written to CMPE bits 3-0 the comparator output will also drive the corresponding port 1 pin.

(This function is available in idle mode.) If the comparator’s enabled to drive the capture input but not the port pin, then the port pin can be used for general purpose I/O. When a comparator output is enabled, pullups at the output pin are disabled and the output becomes open drain.

NXP Microprocessor P87C557 Protected Flash Cloning

The comparator output can be used to trigger a capture input in idle mode by programming the CMPE register to drive the pin from the comparator output to have the pin supply the capture trigger after NXP Microprocessor P87C557 Protected Flash Cloning.

There are two special function registers associated with the comparators. They are CMP which contains the comparator enables and a bit that can be read by software to determine the state of each comparator’s output, and CMPE which controls whether the output from each comparator drives the associated output pin or a capture input associated with one of the PCA modules to proceed with Philip Microcontroller P87L51FB Embedded Firmware copying.

The CMP registers bits 0–3 can be read by software to determine the state of the output of each comparator. To do this the associated comparator must be enabled but the output in port 1 can be disabled. This allows easy polling of the comparator output value without the need to use up a port pin.