PIC18F1230-I/SS Microchip Technology, PIC18F1230-I/SS Datasheet - Page 185

• Manufacturer Part Number: PIC18F1230-I/SS
• Description: Microcontroller
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F1230-I/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SSOP
• Package: 20SSOP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 16
• Interface Type: USART
• On-chip Adc: 4-chx10-bit
• Number Of Timers: 2
• Processor Series: PIC18F
• Core: PIC
• Data Ram Size: 256 B
• Maximum Clock Frequency: 40 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DV164136
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164307 - MODULE SKT FOR PM3 28SSOP
• Lead Free Status / Rohs Status: Details

FIGURE 18-1:
18.2
The full range of voltage reference cannot be realized
due to the construction of the module. The transistors
on the top and bottom of the resistor ladder network
(Figure 18-1) keep CV
reference source rails. The voltage reference is derived
from the reference source; therefore, the CV
changes with fluctuations in that source. The tested
absolute accuracy of the voltage reference can be
found in Section 23.0 “Electrical Characteristics”.
TABLE 18-2:
 2009 Microchip Technology Inc.
CVRCON
CMCON
Legend: Shaded cells are not used with the comparator voltage reference.
Name
Voltage Reference Accuracy/Error
V
AV
CVREN
CVRR
CVREN
REF
C2OUT
DD
Bit 7
REGISTERS ASSOCIATED WITH COMPARATOR VOLTAGE REFERENCE
+
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
REF
CVRSS = 1
CVRSS = 0
C1OUT
AV
Bit 6
from approaching the
—
SS
CVRSS = x
16 Steps
C0OUT
CVRR
Bit 5
REF
8R
output
R
R
R
R
R
R
R
CVRSS
Bit 4
—
8R
CVR3
Bit 3
18.3
When the device wakes up from Sleep through an
interrupt or a Watchdog Timer time-out, the contents of
the CVRCON register are not affected. To minimize
current consumption in Sleep mode, the voltage
reference should be disabled.
18.4
A device Reset disables the voltage reference by clearing
bit, CVREN (CVRCON<7>). This Reset selects the high-
voltage range by clearing bit, CVRR (CVRCON<5>). The
CVR value select bits are also cleared.
—
CVR3:CVR0
Operation During Sleep
Effects of a Reset
PIC18F1230/1330
CMEN2
CVR2
Bit 2
CVREN = 1
CMEN1
CVR1
Bit 1
CVREN = 0
CMEN0
CV
CVR0
Bit 0
DS39758D-page 185
REF
on Page:
Values
Reset
48
48