DM164120-1 Microchip Technology, DM164120-1 Datasheet - Page 24

• Manufacturer Part Number: DM164120-1
• Description: BOARD DEMO PICKIT 2 LP COUNT
• Manufacturer: Microchip Technology
• Type: MCUr

Specifications of DM164120-1

• Contents: 3 Boards (1 Populated, 2 Bare)
• Processor To Be Evaluated: PIC16F690
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC16
• Silicon Core Number: PIC16F
• Silicon Family Name: PIC16F6xxx
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: 28-pin PIC16C, 16F, 18C, 18F
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Low Pin Count Demo Board User’s Guide
DS51556A-page 20
bit 7
bit 6-4
bit 3-0
3.2.4.1
ADCON1 selects the ratio between processor clock speed and conversion speed. This
is important because the ADC needs at least 1.6 μs per bit. Accuracy degrades if the
clock speed is too high. As the processor clock speed increases, an increasingly large
divider is necessary to keep the conversion speed. Four MHz is fastest at 8:1 ratio with
a conversion speed of 2 μs per bit. Refer to the “T
Frequencies” Table in the Analog-to-Digital Section of the PIC16F685/687/689/690
Data Sheet (DS41262) for recommended configurations.
REGISTER 3-1:
bit 7
Unimplemented: Read as ‘0’
ADCS<2:0>: A/D Conversion Clock Select bits
000 =
001 =
010 =
x11 =
100 =
101 =
110 =
Unimplemented: Read as ‘0’
Legend:
R = Readable bit
- n = Value at POR
U-0
—
F
F
F
F
F
F
F
OSC
OSC
OSC
RC
OSC
OSC
OSC
ADCON1
ADCS2
R/W-0
(clock derived from a dedicated internal oscillator = 500 kHz max)
/2
/8
/32
/4
/16
/64
ADCON1 – A/D CONTROL REGISTER 1 (ADDRESS: 9Fh)
ADCS1
R/W-0
W = Writable bit
‘1’ = Bit is set
ADCS0
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U-0
—
AD
vs. Device Operating
U-0
—
© 2005 Microchip Technology Inc.
x = Bit is unknown
U-0
—
U-0
—
bit 0