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| PIC16LF720_11 Datasheet, PDF (59/244 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology | |||
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6.2.4
PIN DESCRIPTIONS AND
DIAGRAMS
Each PORTB pin is multiplexed with other functions. The
pins and their combined functions are briefly described
here. For specific information about individual functions
such as the SSP, I2C⢠or interrupts, refer to the
appropriate section in this data sheet.
6.2.4.1 RB4/AN10/SDI/SDA
Figure 6-7 shows the diagram for this pin. The RB4 pin
is configurable to function as one of the following:
⢠General purpose I/O. Individually controlled
interrupt-on-change. Individually enabled pull-up.
⢠Analog input for the A/D
⢠Synchronous Serial Port Input (SPI)
⢠I2C data I/O
6.2.4.2 RB5/AN11/RX/DT
Figure 6-8 shows the diagram for this pin. The RB5 pin
is configurable to function as one of the following:
⢠General purpose I/O. Individually controlled
interrupt-on-change. Individually enabled pull-up.
⢠Analog input for the A/D
⢠USART asynchronous receive
⢠USART synchronous receive
6.2.4.3 RB6/SCK/SCL
Figure 6-9 shows the diagram for this pin. The RB6 pin
is configurable to function as one of the following:
⢠General purpose I/O. Individually controlled
interrupt-on-change. Individually enabled pull-up.
⢠Synchronous Serial Port clock for both SPI and
I2C
6.2.4.4 RB7/TX/CK
Figure 6-10 shows the diagram for this pin. The RB7
pin is configurable to function as one of the following:
⢠General purpose I/O. Individually controlled
interrupt-on-change. Individually enabled pull-up.
⢠USART asynchronous transmit
⢠USART synchronous clock
PIC16(L)F720/721
FIGURE 6-7:
Data Bus
DQ
WR
WPUB
CK Q
RD
WPUB
BLOCK DIAGRAM OF RB4
Analog(1)
Input mode
VDD
Weak
RABPU
DQ
WR
PORTB
CK Q
WR
TRISB
DQ
CK Q
RD
TRISB
SSPEN
SSP
01
10
From 01
SSP
10
Analog(1)
Input mode
VDD
I/O Pin
VSS
RD
PORTB
DQ
WR
IOCB
CK Q
RD
IOCB
QD
EN
QD
EN
Interrupt-on-
Change
RD PORTB
To SSP
To A/D Converter
Q3
ST
Note 1: ANSEL determines Analog Input mode.
ï£ 2011 Microchip Technology Inc.
Preliminary
DS41430B-page 59
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