PIC16C74-04I/P Microchip Technology, PIC16C74-04I/P Datasheet - Page 117

• Manufacturer Part Number: PIC16C74-04I/P
• Description: MICRO CTRL 4K 4MHZ OTP 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C74-04I/P

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: OTP
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 8x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Eeprom Size: -

13.0
The analog-to-digital (A/D) converter module has five
inputs for the PIC16C72/73/73A/76, and eight for the
PIC16C74/74A/77.
The A/D allows conversion of an analog input signal to
a corresponding 8-bit digital number (refer to Applica-
tion Note AN546 for use of A/D Converter). The output
of the sample and hold is the input into the converter,
which generates the result via successive approxima-
tion. The analog reference voltage is software select-
able to either the device’s positive supply voltage (V
or the voltage level on the RA3/AN3/V
FIGURE 13-1: ADCON0 REGISTER (ADDRESS 1Fh)
1997 Microchip Technology Inc.
bit7
bit 7-6: ADCS1:ADCS0: A/D Conversion Clock Select bits
bit 5-3: CHS2:CHS0: Analog Channel Select bits
bit 2:
bit 1:
bit 0:
ADCS1 ADCS0
Note 1: A/D channels 5, 6, and 7 are implemented on the PIC16C74/74A/77 only.
R/W-0
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
Applicable Devices
72 73 73A 74 74A 76 77
00 = F
01 = F
10 = F
11 = F
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 A/D conversion
is complete)
Unimplemented: Read as '0'
ADON: A/D On bit
1 = A/D converter module is operating
0 = A/D converter module is shutoff and consumes no operating current
R/W-0
OSC
OSC
OSC
RC
(clock derived from an internal RC oscillator)
/2
/8
/32
R/W-0
CHS2
R/W-0
CHS1
REF
(1)
(1)
(1)
pin.
R/W-0
CHS0
DD
GO/DONE
)
R/W-0
The A/D converter has a unique feature of being able to
operate while the device is in SLEEP mode. To operate
in sleep, the A/D conversion clock must be derived from
the A/D’s internal RC oscillator.
The A/D module has three registers. These registers
are:
The ADCON0 register, shown in Figure 13-1, controls
the operation of the A/D module. The ADCON1 regis-
ter, shown in Figure 13-2, configures the functions of
the port pins. The port pins can be configured as ana-
log inputs (RA3 can also be a voltage reference) or as
digital I/O.
• A/D Result Register (ADRES)
• A/D Control Register 0 (ADCON0)
• A/D Control Register 1 (ADCON1)
U-0
—
ADON
R/W-0
bit0
R = Readable bit
W = Writable bit
U = Unimplemented bit,
- n = Value at POR reset
PIC16C7X
read as ‘0’
DS30390E-page 117