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Z8PE002 Datasheet(PDF) 43 Page - Zilog, Inc. |
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Z8PE002 Datasheet(HTML) 43 Page - Zilog, Inc. |
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43 / 48 page  Z8PE002 ZiLOG Z8Plus OTP Microcontroller DS008700-Z8X0799 P R E L I M I N A R Y 43 I/O PORT RESET CONDITIONS Full Reset Port A and Port B output value registers are not affected by RESET . On RESET, the Port A and Port B directional control reg- isters are cleared to all zeros, which defines all pins in both ports as inputs. On RESET, the directional control registers redefine all pins as inputs, and the Port A and Port B input value registers overwrites the previously held data with the current sample of the input pins. On RESET, the Port A and Port B special function registers are cleared to 00h, which deactivates all port special func- tions. Note: The SMR and WDT time-out events are not full device resets. The port control registers are not affected by ei- ther of these events. ANALOG COMPARATOR The device includes one on-chip analog comparator. Pin PB4 features a comparator front end. The comparator ref- erence voltage is on pin PB3. Comparator Description The on-chip comparator can process an analog signal on PB4 with reference to the voltage on PB3. The analog func- tion is enabled by programming the Port B special function register bits 3 and 4. When the analog comparator function is enabled, bit 4 of the input register is defined as holding the synchronized out- put of the comparator, while bit 3 retains a synchronized sample of the reference input. If the interrupts for PB4 are enabled when the comparator special function is selected, the output of the comparator generates interrupts. COMPARATOR OPERATION The comparator output reflects the relationship between the analog input to the reference input. If the voltage on the an- alog input is higher than the voltage on the reference input, then the comparator output is at a High state. If the voltage on the analog input is lower than the voltage on the reference input, then the analog output is at a Low state. Comparator Definitions VICR The usable voltage range for the positive input and reference input is called the Comparator Input Common Mode Voltage Range (VICR). Note: The comparator is not guaranteed to work if the input is outside of the VICR range. VOFFSET The absolute value of the voltage between the positive input and the reference input required to make the comparator output voltage switch is the Comparator Input Offset Volt- age (VOFFSET). IIO For the CMOS voltage comparator input, the input offset current (IIO) is the leakage current of the CMOS input gate. HALT Mode The analog comparator is functional during HALT mode. If the interrupts are enabled, an interrupt generated by the comparator causes a return from HALT mode. STOP Mode The analog comparator is disabled during STOP mode. The comparator is powered down to prevent it from drawing any current. Low Voltage Protection. An on-board Voltage Compar- ator checks that the VCC is at the required level to ensure correct operation of the device. A reset is globally driven if VCC is below the specified voltage (Low Voltage Protec- tion). The device functions normally at or above 3.0V under all conditions, and is guaranteed to function normally at supply voltages above the Low Voltage Protection trip point. Be- low 3.0V, the device functions normally until the Low Volt- |
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