Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 134

• Manufacturer Part Number: Z8F042AHJ020SC00TR
• Description: IC ENCORE XP MCU FLASH 4K 28SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F042AHJ020SC00TR

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IrDA, UART/USART
• Peripherals: Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 23
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Z8F042AHJ020SC00T

PS022825-0908
Hardware Overflow
Automatic Powerdown
Single-Shot Conversion
can output values across the entire 11-bit range, from -1024 to +1023. In
SINGLE-ENDED mode, the output generally ranges from 0 to +1023, but offset errors
can cause small negative values.
The ADC registers actually return 13 bits of data, but the two LSBs are intended for com-
pensation use only. When the software compensation routine is performed on the 13 bit
raw ADC value, two bits of resolution are lost because of a rounding error. As a result, the
final value is an 11-bit number.
When the hardware overflow bit (OVF) is set in ADC Data Low Byte (ADCD_L) register,
all other data bits are invalid. The hardware overflow bit is set for values greater than V
and less than -V
If the ADC is idle (no conversions in progress) for 160 consecutive system clock cycles,
portions of the ADC are automatically powered down. From this powerdown state, the
ADC requires 40 system clock cycles to power up. The ADC powers up when a
conversion is requested by the ADC Control register.
When configured for single-shot conversion, the ADC performs a single analog-to-digital
conversion on the selected analog input channel. After completion of the conversion, the
ADC shuts down. Follow the steps below for setting up the ADC and initiating a single-
shot conversion:
1. Enable the desired analog inputs by configuring the general-purpose I/O pins for
2. Write the
3. Write to the
alternate analog function. This configuration disables the digital input and output
drivers.
The bit fields in the ADC Control register can be written simultaneously (the ADC
can be configured and enabled with the same write instruction):
–
–
–
–
Write to
mode, as well as unbuffered or buffered mode.
Write the
voltage reference level or to disable the internal reference. The
is. contained in the
Write to the
sources (different input pins available depending on the device).
Clear CONT to 0 to select a single-shot conversion.
ADC Control/Status Register 1
ref
ADC Control Register 0
(DIFFERENTIAL mode).
BUFMODE[2:0]
REFSELH
ANAIN[3:0]
ADC Control Register
bit of the pair {
to select SINGLE-ENDED or DIFFERENTIAL
field to select from the available analog input
to configure the ADC and begin the conversion.
to configure the ADC.
REFSELH
0.
Z8 Encore! XP
,
REFSELL
Product Specification
Analog-to-Digital Converter
} to select the internal
®
F082A Series
REFSELL
bit
ref
123