PIC16C712-20/SO Microchip Technology, PIC16C712-20/SO Datasheet - Page 21

• Manufacturer Part Number: PIC16C712-20/SO
• Description: IC MCU OTP 1KX14 A/D PWM 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C712-20/SO

• Core Size: 8-Bit
• Program Memory Size: 1.75KB (1K x 14)
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Core Processor: PIC
• Speed: 20MHz
• Number Of I /o: 13
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 4x8b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 18-SOIC (7.5mm Width)
• Controller Family/series: PIC16C
• No. Of I/o's: 13
• Ram Memory Size: 128Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

3.0
Some pins for these I/O ports are multiplexed with an
alternate function for the peripheral features on the
device. In general, when a peripheral is enabled, that
pin may not be used as a general purpose I/O pin.
Additional information on I/O ports may be found in the
PICmicro™
(DS33023).
3.1
PORTA is a 5-bit wide bi-directional port. The corre-
sponding data direction register is TRISA. Setting a
TRISA bit (=1) will make the corresponding PORTA pin
an input, (i.e., put the corresponding output driver in a
hi-impedance mode). Clearing a TRISA bit (=0) will
make the corresponding PORTA pin an output, (i.e., put
the contents of the output latch on the selected pin).
Reading the PORTA register reads the status of the
pins whereas writing to it will write to the port latch. All
write operations are read-modify-write operations.
Therefore a write to a port implies that the port pins are
read, the value is modified, and then written to the port
data latch.
FIGURE 3-1:
1998 Microchip Technology Inc.
I/O PORTS
PORTA and the TRISA Register
Mid-Range
BLOCK DIAGRAM OF RA3:RA0
DATA
BUS
WR
PORT
WR
TRIS
RD PORT
To A/D Converter
Reference
D
Data Latch
D
TRIS Latch
CK
CK
Manual,
Q
Q
Q
Q
RD TRIS
Preliminary
Q
EN
Pin RA4 is multiplexed with the Timer0 module clock
input to become the RA4/T0CKI pin. The RA4/T0CKI
pin is a Schmitt Trigger input and an open drain output.
All other RA port pins have TTL input levels and full
CMOS output drivers.
PORTA pins, RA3:0, are multiplexed with analog inputs
and analog V
selected by clearing/setting the control bits in the
ADCON1 register (A/D Control Register1).
The TRISA register controls the direction of the RA
pins, even when they are being used as analog inputs.
The user must ensure the bits in the TRISA register are
maintained set when using them as analog inputs.
EXAMPLE 3-1:
BCF
CLRF
BSF
MOVLW
MOVWF
BCF
D
Note:
V
V
P
N
Analog
input
mode
SS
DD
STATUS, RP0
PORTA
STATUS, RP0
0xEF
TRISA
STATUS, RP0
V
SS
V
On a Power-on Reset, these pins are con-
figured as analog inputs and read as '0'.
DD
REF
PIC16C712/716
TTL
Input
Buffer
I/O pin
input. The operation of each pin is
INITIALIZING PORTA
;
; Initialize PORTA by
; clearing output
; data latches
; Select Bank 1
; Value used to
; initialize data
; direction
; Set RA<3:0> as inputs
; RA<4> as outputs
; Return to Bank 0
DS41106A-page 21