PIC16F1526 datasheet(131/354 Pages) MICROCHIP

131 / 354 page

 2011 Microchip Technology Inc.

Preliminary

DS41458A-page 131

PIC16(L)F1526/27

12.6

PORTE Registers

PORTE is a 8-bit wide, bidirectional port. The

corresponding data direction register is TRISE

(Register 12-7). Setting a TRISE bit (= 1) will make the

corresponding PORTE pin an input (i.e., put the

corresponding output driver in a High-Impedance mode).

Clearing a TRISE bit (= 0) will make the corresponding

PORTE pin an output (i.e., enable the output driver and

put the contents of the output latch on the selected pin).

Example 12-1 shows how to initialize an I/O port.

Reading the PORTE register (Register 12-6) 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, this value is modified and then written

to the PORT data latch (LATE).

The TRISE register (Register 12-7) controls the PORTE

pin output drivers, even when they are being used as

analog inputs. The user should ensure the bits in the

TRISE register are maintained set when using them as

analog inputs. I/O pins configured as analog input always

read ‘0’.

12.6.1

ANSELE REGISTER

The ANSELE register (Register 12-9) is used to

configure the Input mode of an I/O pin to analog.

Setting the appropriate ANSELE bit high will cause all

digital reads on the pin to be read as ‘0’ and allow

analog functions on the pin to operate correctly.

The state of the ANSELE bits has no effect on digital out-

put functions. A pin with TRIS clear and ANSELE set will

still operate as a digital output, but the Input mode will be

analog. This can cause unexpected behavior when exe-

cuting read-modify-write instructions on the affected

port.

12.6.2

PORTE FUNCTIONS AND OUTPUT

PRIORITIES

Each PORTE pin is multiplexed with other functions. The

pins, their combined functions and their output priorities

are shown in Table 12-11.

When multiple outputs are enabled, the actual pin

control goes to the peripheral with the highest priority.

Analog input and some digital input functions are not

included in the list below. These input functions can

remain active when the pin is configured as an output.

Certain digital input functions override other port

functions and are included in Table 12-11.

Note:

The ANSELE bits default to the Analog

mode after Reset. To use any pins as

digital general purpose or peripheral

inputs, the corresponding ANSEL bits

must be initialized to ‘0’ by user software.

TABLE 12-11: PORTE OUTPUT PRIORITY

Pin Name

Function Priority(1)

RE0

RE1

RE2

CCP10

RE2

RE3

CCP9

RE3

RE4

CCP8

RE4

RE5

CCP7

RE5

RE6

CCP6

RE6

RE7

CCP2

RE7

Note 1:

Priority listed from highest to lowest.

PIC16F1526 Datasheet(PDF) 131 Page - Microchip Technology

PIC16F1526 Datasheet(HTML) 131 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL