PIC16F74-I/L Microchip Technology Inc., PIC16F74-I/L Datasheet - Page 85

• Manufacturer Part Number: PIC16F74-I/L
• Description: 44 PIN, 7 KB FLASH, 192 RAM, 33 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F74-I/L

• A/d Inputs: 8-Channel, 8-Bit
• Cpu Speed: 5 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 33
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 44-pin PLCC
• Programmable Memory: 7K Bytes
• Ram Size: 192 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

11.0
The 8-bit analog-to-digital (A/D) converter module has
five inputs for the PIC16F73/76 and eight for the
PIC16F74/77.
The A/D allows conversion of an analog input signal to
a corresponding 8-bit digital number. The output of the
sample and hold is the input into the converter, which
generates the result via successive approximation. The
analog reference voltage is software selectable to
either the device’s positive supply voltage (V
voltage level on the RA3/AN3/V
The A/D converter has a unique feature of being able
to operate while the device is in SLEEP mode. To oper-
ate in SLEEP, the A/D conversion clock must be
derived from the A/D’s internal RC oscillator.
REGISTER 11-1:
 2002 Microchip Technology Inc.
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
bit 7-6
bit 5-3
bit 2
bit 1
bit 0
ADCON0 REGISTER (ADDRESS 1Fh)
bit 7
ADCS1:ADCS0: A/D Conversion Clock Select bits
00 = F
01 = F
10 = F
11 = F
CHS2:CHS0: Analog Channel Select bits
000 = Channel 0 (RA0/AN0)
001 = Channel 1 (RA1/AN1)
010 = Channel 2 (RA2/AN2)
011 = Channel 3 (RA3/AN3)
100 = Channel 4 (RA5/AN4)
101 = Channel 5 (RE0/AN5)
110 = Channel 6 (RE1/AN6)
111 = Channel 7 (RE2/AN7)
GO/DONE: A/D Conversion Status bit
If ADON = 1:
1 = A/D conversion in progress (setting this bit starts the A/D conversion)
0 = A/D conversion not in progress (this bit is automatically cleared by hardware when the
Unimplemented: Read as '0'
ADON: A/D On bit
1 = A/D converter module is operating
0 = A/D converter module is shut-off and consumes no operating current
Legend:
R = Readable bit
- n = Value at POR reset
ADCS1
R/W-0
Note 1: A/D channels 5, 6 and 7 are implemented on the PIC16F74/77 only.
A/D conversion is complete)
OSC
OSC
OSC
RC
REF
(clock derived from the internal A/D module RC oscillator)
/2
/8
/32
pin.
ADCS0
R/W-0
DD
), or the
R/W-0
CHS2
(1)
(1)
(1)
W = Writable bit
’1’ = Bit is set
R/W-0
CHS1
The A/D module has three registers. These registers
are:
The ADCON0 register, shown in Register 11-1, con-
trols the operation of the A/D module. The ADCON1
register, shown in Register 11-2, configures the func-
tions of the port pins. The port pins can be configured
as analog inputs (RA3 can also be a voltage reference),
or as digital I/O.
Additional information on using the A/D module can be
found in the PICmicro™ Mid-Range MCU Family Ref-
erence Manual (DS33023) and in Application Note,
AN546 (DS00546).
• A/D Result Register ((ADRES)
• A/D Control Register 0 (ADCON0)
• A/D Control Register 1 ((ADCON1)
R/W-0
CHS0
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
GO/DONE
R/W-0
PIC16F7X
x = Bit is unknown
DS30325B-page 83
U-0
—
ADON
R/W-0
bit 0