PIC18C252-E/SO Microchip Technology, PIC18C252-E/SO Datasheet - Page 79

• Manufacturer Part Number: PIC18C252-E/SO
• Description: IC MCU OTP 16KX16 A/D 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C252-E/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: OTP
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-SOIC (7.5mm Width)
• Processor Series: PIC18C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 1.5 KB
• Interface Type: MSSP, SPI, I2C, USART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 1 x 16 bit
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: ICE2000, DM163022, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5 bit
• For Use With: I3DB18C452 - BOARD DAUGHTER ICEPIC3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC18C252E/SO

8.0
Depending on the device selected, there are either five
ports, or three ports available. Some pins of the I/O
ports are multiplexed with an alternate function from
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.
Each port has three registers for its operation. These
registers are:
• TRIS register (data direction register)
• PORT register (reads the levels on the pins of the
• LAT register (output latch)
The data latch (LAT register) is useful for read-modify-
write operations on the value that the I/O pins are
driving.
8.1
PORTA is a 6-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.
The Data Latch register (LATA) is also memory
mapped. Read-modify-write operations on the LATA
register reads and writes the latched output value for
PORTA.
The RA4 pin 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.
The other PORTA pins are multiplexed with analog
inputs and the analog V
operation of each pin is 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.
device)
Note:
Note:
2001 Microchip Technology Inc.
I/O PORTS
PORTA, TRISA and LATA
Registers
On a Power-on Reset, these pins are con-
figured as digital inputs.
On a Power-on Reset, these pins are con-
figured as analog inputs and read as '0'.
REF
+ and V
REF
- inputs. The
EXAMPLE 8-1:
FIGURE 8-1:
WR TRISA
CLRF PORTA
CLRF LATA
MOVLW 0x07
MOVWF ADCON1
MOVLW 0xCF
MOVWF TRISA
Note 1: I/O pins have protection diodes to V
WR LATA
or
PORTA
Data
Bus
RD PORTA
To A/D Converter and LVD Modules
SS Input (RA5 only)
TRIS Latch
Data Latch
D
D
CK
CK
RD LATA
; Initialize PORTA by
; clearing output
; data latches
; Alternate method
; to clear output
; data latches
; Configure A/D
; for digital inputs
; initialize data
; direction
; Set RA<3:0> as inputs
; RA<5:4> as outputs
; Value used to
INITIALIZING PORTA
BLOCK DIAGRAM OF
RA3:RA0 AND RA5 PINS
Q
Q
Q
Q
PIC18CXX2
RD TRISA
Q
Analog
Input
Mode
EN
DS39026C-page 77
D
DD
V
V
N
P
SS
DD
and V
TTL
Input
Buffer
I/O pin
SS
.
(1)