參數(shù)資料
型號： PIC16CR7X
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 39/172頁
文件大小： 1506K
代理商： PIC16CR7X
2007 Microchip Technology Inc.
DS21993C-page 37
PIC16CR7X
4.5
PORTE and TRISE Register
This section is not applicable to the PIC16CR73 or
PIC16CR76.
PORTE has three pins, RE0/RD/AN5, RE1/WR/AN6
and RE2/CS/AN7, which are individually configureable
as inputs or outputs. These pins have Schmitt Trigger
input buffers.
I/O PORTE becomes control inputs for the micro-
processor port when bit PSPMODE (TRISE<4>) is set.
In this mode, the user must make sure that the
TRISE<2:0> bits are set (pins are configured as digital
inputs). Ensure ADCON1 is configured for digital I/O. In
this mode, the input buffers are TTL.
Register 4-1 shows the TRISE register, which also
controls the Parallel Slave Port operation.
PORTE pins are multiplexed with analog inputs. When
selected as an analog input, these pins will read as ‘
0
’s.
TRISE controls the direction of the RE pins, even when
they are being used as analog inputs. The user must
make sure to keep the pins configured as inputs when
using them as analog inputs.
FIGURE 4-7:
PORTE BLOCK DIAGRAM
(IN I/O PORT MODE)
Note:
On a Power-on Reset, these pins are
configured as analog inputs and read as
‘
0
’.
Data Bus
WR Port
WR TRIS
RD Port
Data Latch
TRIS Latch
RD TRIS
Schmitt
Trigger
Input
Buffer
I/O pin
(1)
Note 1:
I/O pins have protection diodes to V
DD
and V
SS
.
Q
D
CK
Q
D
CK
EN
Q
D
EN
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