PIC18C658-I/L Microchip Technology, PIC18C658-I/L Datasheet - Page 243

• Manufacturer Part Number: PIC18C658-I/L
• Description: IC PIC MCU OTP 16KX16 68PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C658-I/L

• Core Size: 8-Bit
• Program Memory Size: 32KB (16K x 16)
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: CAN, I²C, SPI, UART/USART
• Number Of I /o: 52
• Program Memory Type: OTP
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 68-PLCC
• Controller Family/series: PIC18
• No. Of I/o's: 52
• Ram Memory Size: 1.5KB
• Cpu Speed: 40MHz
• No. Of Timers: 4
• Processor Series: PIC18C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 1536 B
• Interface Type: 3-Wire, I2C, SPI, USART, CAN
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 52
• Number Of Timers: 4 bit
• Operating Supply Voltage: 2.5 V to 5.5 V
• 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: ICE2000, DM163007, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164308 - MODULE SKT FOR PM3 68PLCCDVA18PQ640 - DEVICE ADAPT PIC18C658 64-TQFPAC174007 - MODULE SKT PROMATEII 68PLCC
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC18C658IL; Q1162292

20.0
The Comparator Voltage Reference is a 16-tap resistor
ladder network that provides a selectable voltage refer-
ence. The resistor ladder is segmented to provide two
ranges of CV
tion to conserve power when the reference is not being
used. The CVRCON register controls the operation of
the reference as shown in Register 20-1. The block dia-
gram is given in Figure 20-1.
The comparator reference supply voltage can come
from either V
V
comparator reference supply voltage is controlled by
the CVRSS bit.
REGISTER 20-1: VRCON REGISTER
REF
2000 Microchip Technology Inc.
- that are multiplexed with RA3 and RA2. The
COMPARATOR VOLTAGE
REFERENCE MODULE
REF
DD
bit 7
bit 6
bit 5
bit 4
bit 3-0
or V
values and has a power-down func-
SS
bit 7
VREN: Comparator Voltage Reference Enable
1 = CV
0 = CV
VROE: Comparator V
1 = CV
0 = CV
VRR: Comparator V
1 = 0.00 CV
0 = 0.25 CV
VRSS: Comparator V
1 = Comparator reference source CV
0 = Comparator reference source CV
VR3:VR0: Comparator V
When VRR = 1:
CV
When VRR = 0:
CV
Legend:
R = Readable bit
- n = Value at POR
, or the external V
R/W-0
VREN
REF
REF
= (VR<3:0>/ 24) (CV
= 1/4 (CV
REF
REF
REF
REF
circuit powered on
circuit powered down
voltage level is also output on the RF5/AN10/CV
voltage is disconnected from the RF5/AN10/CV
RSRC
RSRC
R/W-0
VROE
RSRC
to 0.75 CV
to 0.75 CV
Advanced Information
REF
REF
REF
REF
) + (VR3:VR0/ 32) (CV
Range Selection
+ and
REF
Source Selection
Output Enable
R/W-0
’1’ = Bit is set
VRR
W = Writable bit
Value Selection 0
RSRC
RSRC
RSRC
, with CV
, with CV
)
RSRC
RSRC
R/W-0
VRSS
20.1
The Comparator Voltage Reference can output 16 dis-
tinct voltage levels for each range. The equations used
to calculate the output of the Comparator Voltage Ref-
erence are as follows:
The settling time of the Comparator Voltage Reference
must be considered when changing the CV
(Section 25.0).
RSRC
RSRC
= V
= V
If CVRR = 1:
CV
If CVRR = 0:
CV
REF
DD
REF
REF
RSRC
/24 step size
/32 step size
VR3:VR0
Configuring the Comparator Voltage
Reference
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
-V
+-V
= (CV
R/W-0
= (CV
SS
VR3
)
REF
R
DD
-
<3:0>/24) x CV
REF
x 1/4) + (CV
REF
15
R/W-0
VR2
pin
PIC18CXX8
pin
x = Bit is unknown
R
RSRC
R/W-0
<3:0>/32) x CV
VR1
DS30475A-page 243
REF
R/W-0
VR0
output
RSRC
bit 0