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參數(shù)資料
| 型號： | PIC12F510_07 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8/14-Pin, 8-Bit Flash Microcontroller |
| 中文描述： | 8/14-Pin，8位閃存微控制器 |
| 文件頁數(shù)： | 29/116頁 |
| 文件大小： | 907K |
| 代理商： | PIC12F510_07 |
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2007 Microchip Technology Inc.
Preliminary
DS41268C-page 27
PIC12F510/16F506
5.0
I/O PORT
As with any other register, the I/O register(s) can be
written and read under program control. However, read
instructions (e.g.,
MOVF PORTB
,
W
) always read the I/O
pins independent of the pin’s Input/Output modes. On
Reset, all I/O ports are defined as input (inputs are at
high-impedance) since the I/O control registers are all
set.
5.1
PORTB/GPIO
PORTB/GPIO is an 8-bit I/O register. Only the low-
order 6 bits are used (RB/GP<5:0>). Bits 7 and 6 are
unimplemented and read as ‘
0
’s. Please note that RB3/
GP3 is an input only pin. The Configuration Word can
set several I/O’s to alternate functions. When acting as
alternate functions, the pins will read as ‘
0
’ during a port
read. Pins RB0/GP0, RB1/GP1, RB3/GP3 and RB4
(PIC16F506 only) can be configured with weak pull-up
and also for wake-up on change. The wake-up on
change and weak pull-up functions are not pin select-
able. If RB3/GP3/MCLR is configured as MCLR, weak
pull-up is always on and wake-up on change for this pin
is not enabled.
5.2
PORTC (PIC16F506 Only)
PORTC is an 8-bit I/O register. Only the low-order 6 bits
are used (RC<5:0>). Bits 7 and 6 are unimplemented
and read as ‘
0
’s.
5.3
TRIS Registers
The Output Driver Control register is loaded with the
contents of the W register by executing the
TRIS
f
instruction. A ‘
1
’ from a TRIS register bit puts the corre-
sponding output driver in a High-Impedance mode. A
‘
0
’ puts the contents of the output data latch on the
selected pins, enabling the output buffer. The exception
is RB3/GP3, which are input only, and the T0CKI pin,
which may be controlled by the OPTION register. See
Register 4-3.
5.4
I/O Interfacing
The equivalent circuit for an I/O port pin is shown in
Figure 5-1. All port pins, except RB3/GP3 which is
input only, may be used for both input and output oper-
ations. For input operations, these ports are non-latch-
ing. Any input must be present until read by an input
instruction (e.g.,
MOVF PORTB
,
W
). The outputs are
latched and remain unchanged until the output latch is
rewritten. To use a port pin as output, the correspond-
ing direction control bit in TRIS must be cleared (=
0
).
For use as an input, the corresponding TRIS bit must
be set. Any I/O pin (except RB3/GP3) can be
programmed individually as input or output.
FIGURE 5-1:
PIC12F510/16F506
EQUIVALENT CIRCUIT
FOR PIN DRIVE
(2)
Note:
On the PIC12F510, I/O PORTB is refer-
enced as GPIO. On the PIC16F506, I/O
PORTB is referenced as PORTB.
Note:
A read of the port reads the pins, not the
output data latches. That is, if an output
driver on a pin is enabled and driven high
but the external system is holding it low, a
read of the port will indicate that the pin is
low.
Note:
The TRIS registers are “write-only” and
are set (output drivers disabled) upon
Reset.
Data
Bus
Q
D
Q
CK
P
N
Interface
Data
Bus
V
SS
V
DD
I/O
pin
Reset
Note 1:
GP3/RB3 has protection diode to V
SS
only.
For pin specific information, see Figure 5-2
through Figure 5-13.
2:
V
SS
V
DD
(1)
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| PIC12F510-E/MC | 功能描述:8位微控制器 -MCU 1.5 KB Flash 38 RAM 6 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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