PIC18F6621-I/PT Microchip Technology Inc., PIC18F6621-I/PT Datasheet - Page 111

• Manufacturer Part Number: PIC18F6621-I/PT
• Description: 64 PIN, 64 KB FLASH, 3840 RAM, 52 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F6621-I/PT

• A/d Inputs: 12-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 1024 Bytes
• Input Output: 54
• Interface: I2C/SPI/UART/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 64-pin TQFP
• Programmable Memory: 64K Bytes
• Ram Size: 3.8K Bytes
• Speed: 40 MHz
• Timers: 2-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

10.3
PORTC is an 8-bit wide, bidirectional port. The corre-
sponding data direction register is TRISC. Setting a
TRISC bit (= 1) will make the corresponding PORTC
pin an input (i.e., put the corresponding output driver in
a high-impedance mode). Clearing a TRISC bit (= 0)
will make the corresponding PORTC pin an output (i.e.,
put the contents of the output latch on the selected pin).
The Data Latch register (LATC) is also memory
mapped. Read-modify-write operations on the LATC
register, read and write the latched output value for
PORTC.
PORTC is multiplexed with several peripheral functions
(Table 10-5). PORTC pins have Schmitt Trigger input
buffers.
When enabling peripheral functions, care should be
taken in defining TRIS bits for each PORTC pin. Some
peripherals override the TRIS bit to make a pin an
output, while other peripherals override the TRIS bit to
make a pin an input. The user should refer to the
corresponding peripheral section for the correct TRIS
bit settings.
FIGURE 10-8:
 2005 Microchip Technology Inc.
Note:
RD LATC
Data Bus
RD TRISC
Peripheral Output
Enable
PORTC/Peripheral Out Select
Peripheral Data Out
WR PORTC
WR TRISC
RD PORTC
Peripheral Data In
WR LATC
Note 1: I/O pins have diode protection to V
PORTC, TRISC and LATC
Registers
(2)
2: Peripheral output enable is only active if peripheral select is active.
On a Power-on Reset, these pins are
configured as digital inputs.
or
PORTC BLOCK DIAGRAM (PERIPHERAL OUTPUT OVERRIDE)
TRIS Latch
Data
D
D
CK
CK
Latch
Q
Q
Q
Q
PIC18F6525/6621/8525/8621
DD
Override
and V
TRIS
Logic
0
1
Q
SS
.
EN
D
The pin override value is not loaded into the TRIS
register. This allows read-modify-write of the TRIS
register without concern due to peripheral overrides.
RC1 is normally configured by configuration bit,
CCP2MX, as the default peripheral pin of the ECCP2
module (default/erased state, CCP2MX = 1).
EXAMPLE 10-3:
CLRF
CLRF
MOVLW
MOVWF
Schmitt
Trigger
V
N
P
V
DD
SS
PORTC
LATC
0xCF
TRISC
RC0
RC1
RC2
RC3
RC4
RC5
RC6
RC7
Pin
I/O pin
; Initialize PORTC by
; clearing output
; data latches
; Alternate method
; to clear output
; data latches
; Value used to
; initialize data
; direction
; Set RC<3:0> as inputs
; RC<5:4> as outputs
; RC<7:6> as inputs
INITIALIZING PORTC
(1)
Override
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
TRIS OVERRIDE
for Timer1/Timer3
Timer1 Oscillator
Xmit, Sync Clock
DS39612B-page 109
Timer1 OSC for
USART1 Async
Timer1/Timer3,
USART1 Sync
Master Clock
SPI Data Out
I
SPI™/I
2
ECCP2 I/O
ECCP1 I/O
Peripheral
C Data Out
Data Out
2
C™