PIC16C432-E/SS Microchip Technology, PIC16C432-E/SS Datasheet - Page 43

• Manufacturer Part Number: PIC16C432-E/SS
• Description: IC MCU CMOS 8BIT 20MHZ 2K 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C432-E/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: LIN (Local Interconnect Network)
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 12
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-SSOP
• For Use With: XLT20SS-1 - SOCKET TRANSITION 18DIP 20SSOPAC164307 - MODULE SKT FOR PM3 28SSOPAC164029 - MODULE SKT PROMATEII 20DIP/SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

8.0
The Voltage Reference is a 16-tap resistor ladder
network that provides a selectable voltage reference.
The resistor ladder is segmented to provide two ranges
of V
conserve power when the reference is not being used.
The VRCON register controls the operation of the
reference as shown in Register 8-1. The block diagram
is given in Figure 8-1.
REGISTER 8-1:
FIGURE 8-1:
2002 Microchip Technology Inc.
Note 1:
V
REN
REF
VOLTAGE REFERENCE
MODULE
values and has a power-down function to
bit 7
bit 6
bit 5
bit 4
bit 3-0
R is defined in Table 12-2
V
REF
V
1 = V
0 = V
V
1 = V
0 = V
V
1 = Low Range
0 = High Range
Unimplemented: Read as '0'
V
when V
when V
bit7
Legend:
R = Readable bit
- n = Value at POR reset
VRCON REGISTER (ADDRESS 9Fh)
VOLTAGE REFERENCE BLOCK DIAGRAM
R
REN
ROE
RR
R/W-0
<3:0>: V
V
: V
REN
: V
: V
REF
REF
REF
REF
REF
RR
RR
REF
REF
circuit powered on
circuit powered down, no I
is output on RA2 pin
is disconnected from RA2 pin
8R
= 1: V
= 0: V
Range Selection bit
REF
Enable bit
Output Enable bit
.
R/W-0
Value Selection 0
V
REF
REF
ROE
R
= (V
= 1/4 * V
R
<3:0>/ 24) * V
R/W-0
R
V
W = Writable bit
’1’ = Bit is set
Preliminary
DD
RR
+ (V
16 Stages
16-1 Analog Mux
V
DD
R
R
<3:0>/ 32) * V
[3:0]
drain
DD
U-0
—
8.1
The Voltage Reference can output 16 distinct voltage
levels for each range.
The equations used to calculate the output of the
Voltage Reference are as follows:
if V
if V
The setting time of the Voltage Reference must be
considered
(Table 12.1). Example 8-1 shows an example of how
to configure the Voltage Reference for an output volt-
age of 1.25V with V
15
R
RR
RR
R/W-0
Configuring the Voltage Reference
U = Unimplemented bit, read as ‘0’
= 0: V
’0’ = Bit is cleared
= 1: V
V
DD
R3
R
REF
REF
when
= (V
= (V
R/W-0
DD
V
DD
R
R2
changing
<3:0>/24) x V
8R
= 5.0V.
PIC16C432
x 1/4) + (V
V
V
R
R
3
0
x = Bit is unknown
(From VRCON<3:0>)
R/W-0
V
the
R1
DS41140B-page 41
R
<3:0>/32) x V
DD
V
V
RR
REF
R/W-0
V
R0
output
bit0
DD