參數(shù)資料
型號: PIC14000
廠商: Microchip Technology Inc.
英文描述: CTV 22C 22#22D SKT RECP
中文描述: 28引腳可編程混合信號控制器
文件頁數(shù): 26/152頁
文件大?。?/td> 953K
代理商: PIC14000
PIC14000
DS40122B-page 26
Preliminary
1996 Microchip Technology Inc.
FIGURE 5-2:
PORTA DATA REGISTER
05h
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PORTA
RA3/AN3
RA2/AN2
RA1/AN1
RA0/AN0
Read/Write
U
U
U
U
R/W
R/W
R/W
R/W
POR value 0xh
0
0
0
0
X
X
X
X
Bit
Name
Function
B7-B4
Unimplemented. Reads as‘0’.
B3
RA3/AN3
GPIO or analog input. Returns value on pin RA3/AN3 when used as a digital
input. When configured as an analog input, reads as ‘0’.
B2
RA2/AN2
GPIO or analog input. Returns value on pin RA2/AN2 when used as a digital
input. When configured as an analog input, reads as ‘0’.
B1
RA1/AN1
GPIO or analog input. Returns value on RA1/AN1 when used as a digital input.
This pin can connect to a level shift network. If enabled, a +0.5V offset is added
to the input voltage. When configured as an analog input, reads as ‘0’.
B0
RA0/AN0
GPIO or analog input. Returns value on pin RA0/AN0 when used as a digital
input. When configured as an analog input, reads as ‘0’.
5.2
PORTC and TRISC
PORTC is a 8-bit wide bidirectional port, with Schmitt
Trigger inputs, that serves the following functions
depending on programming:
Direct LED drive (PORTC<7:0>).
I
C communication lines (PORTC<7:6>), refer to
Section 7.0 I
C Serial Port.
Interrupt on change function (PORTC<7:4>),
discussed below and in Section 10.3 Interrupts.
Programmable reference and comparator
outputs.
Timer0 clock source on RC3
The PORTC data register is located at location 07h and
its data direction register (TRISC) is at 87h.
PORTC<5:0> have weak internal pull-ups (~100 uA
typical). A single control bit can turn on all the pull-ups.
This is done by clearing bit RCPU (OPTION<7>). The
weak pull-up is automatically turned off when the port
pin is configured as an output. The pull-ups are
disabled on power-on reset and in hibernate mode.
2
2
When using PORTC<0> as an analog output
(CMCON<1> bit is set), the TRISC<0> bit should be
cleared to disable the weak pull-up on this pin. Refer to
Table 5-1.
Four of the PORTC pins, RC<7:4> have an interrupt on
change feature. Only pins configured as inputs can
cause this interrupt to occur. In other words, any pin
RC<7:4> configured as an output is excluded from the
interrupt on change comparison. The input pins of
RC<7:4> are compared with the old value latched on
the last read of PORTC. The “mismatch” outputs of
RC<7:4> are OR’ed together to assert the RCIF flag
(PIR1 register<2>) and cause a CPU interrupt, if
enabled.
Note:
If
(I
automatically
interrupt-on-change comparison.
the
I
2
C
function
is
enabled,
2
CCON<5>, address 14h), RC<7:6> are
excluded
from
the
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