PIC18F27J53T-I/SO Microchip Technology, PIC18F27J53T-I/SO Datasheet - Page 145

• Manufacturer Part Number: PIC18F27J53T-I/SO
• Description: 28-pin, USB, 128KB Flash, 4KB RAM, 12 MIPS, 12-bit ADC, NanoWatt XLP 28 SOIC .30
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F27J53T-I/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 2.15 V ~ 3.6 V
• Data Converters: A/D 10x10b/12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 3.8 KB
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 48 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 8
• Operating Supply Voltage: 2.15 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

REGISTER 10-4:
10.2
PORTA is a 7-bit wide, bidirectional port. It may
function as a 5-bit port, depending on the oscillator
mode selected. Setting a TRISA bit (= 1) will make the
corresponding PORTA pin an input (i.e., put the
corresponding output driver in a High-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 (LATA) register is also memory mapped.
Read-modify-write operations on the LATA register read
and write the latched output value for PORTA.
The other PORTA pins are multiplexed with analog
inputs, the analog V
parator voltage reference output. The operation of pins,
RA<3:0> and RA5, as A/D Converter inputs is selected
by clearing or setting the control bits in the ADCON0
register (A/D Port Configuration Register 0).
Pins, RA0, RA2, and RA3, may also be used as com-
parator inputs and by setting the appropriate bits in the
CMCON register. To use RA<3:0> as digital inputs, it is
also necessary to turn off the comparators.
 2010 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-3
bit 2-1
bit 0
Note 1:
Note:
U-0
—
PORTA, TRISA and LATA Registers
To enable the actual RTCC output, the RTCOE (RTCCFG<2>) bit needs to be set.
On a Power-on Reset (POR), RA5 and
RA<3:0> are configured as analog inputs
and read as ‘0’.
Unimplemented: Read as ‘0’
RTSECSEL<1:0>: RTCC Seconds Clock Output Select bits
11 = Reserved; do not use
10 = RTCC source clock is selected for the RTCC pin (can be INTRC, T1OSC or T1CKI depending
01 = RTCC seconds clock is selected for the RTCC pin
00 = RTCC alarm pulse is selected for the RTCC pin
PMPTTL: PMP Module TTL Input Buffer Select bit
1 = PMP module uses TTL input buffers
0 = PMP module uses Schmitt Trigger input buffers
U-0
REF
—
upon the RTCOSC (CONFIG3L<1>) and T1OSCEN (T1CON<3>) bit settings)
PADCFG1: PAD CONFIGURATION CONTROL REGISTER 1 (BANKED F3Ch)
+ and V
W = Writable bit
‘1’ = Bit is set
REF
U-0
—
- inputs and the com-
U-0
—
Preliminary
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U-0
—
PIC18F47J53 FAMILY
All PORTA pins have TTL input levels and full CMOS
output drivers.
The TRISA register controls the direction of the PORTA
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 10-2:
CLRF
CLRF
MOVLW
MOVWF
MOVWF
MOVWF
MOVLW
MOVWF
RTSECSEL1
PORTA
LATA
07h
ADCON0 ; for digital inputs
07h
CMCON
0CFh
TRISA
R/W-0
(1)
; Initialize PORTA by
; clearing output
; data latches
; Alternate method
; to clear output
; data latches
; Configure A/D
; Configure comparators
; for digital input
; Value used to
; initialize data
; direction
; Set RA<3:0> as inputs
; RA<5:4> as outputs
(1)
INITIALIZING PORTA
RTSECSEL0
x = Bit is unknown
R/W-0
DS39964B-page 145
(1)
PMPTTL
R/W-0
bit 0