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| 型号： | MCP25020-I/P |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDIP14 |
| 封装： | 0.300 INCH, PLASTIC, DIP-14 |
| 文件页数： | 25/66页 |
| 文件大小： | 1028K |
| 代理商： | MCP25020-I/P |
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2007 Microchip Technology Inc.
DS21664D-page 31
MCP2502X/5X
5.0
GPIO MODULE
5.1
Description
The MCP2502X/5X has eight general-purpose input/
output pins (GP0 to GP7), collectively labeled GPIO. All
GPIO port pins have TTL input levels and full CMOS
output drivers, with the exception of GP7, which is input
only. Pins GP6:GP0 can be individually configured as
input or output via the GPDDR register.
Each of the GPIO pins has a weak internal pull-up
resistor. A single control bit (OPTREG.GPPU) can turn
on/off all the pull-ups. The weak pull-up is automatically
turned off when the port pin is configured as an output.
The pull-ups are disabled during a Power-on Reset.
All pins are multiplexed with an alternate function,
including analog-to-digital conversion on up to four of
the GPIO pins, analog VREF inputs up to two pins, PWM
outputs up to two pins, clock-out function and external
reset. The operation of each pin is selected by clearing,
or setting, control bits in various control registers. GPIO
pin functions are summarized in Table 5-1.
TABLE 5-1:
GPIO FUNCTIONS
5.2
Digital Input Edge Detection
All GPIO pins have a digital input edge detection
feature that will automatically transmit a message when
an edge with the proper polarity occurs on any of the
digital inputs. Only pins configured as inputs and
enabled for this function via control register IOINTPO
will perform this operation.
Three control registers are associated with this
function. An enable pin for each GPIO pin resides in the
IOINTEN register. When a bit is set to a '1', the
corresponding GPIO pin is enabled to generate a
transmit-on-change message (TXID2) when an edge of
specified polarity occurs.
The digital edge detection function on a GPIO pin
configured as a digital input is edge triggered. A rising-
edge will generate a transmission if the corresponding
bit in the IOINTPO register is set. A falling-edge will
generate a transmission if the bit is cleared. When a
valid edge appears on the enabled GPIO pin, CAN
message TXID2 is initiated.
The edge-detection function on any given GPIO pin
(configured as a digital input) can wake up the
processor from SLEEP if the corresponding interrupt
enable bit in the IOINTEN register was set prior to
going into SLEEP mode. If a wake-up from SLEEP is
caused in this manner, the device will immediately
initiate a transmit message (TXID2).
Note:
The GPDDR register controls the direction
of the GPIO pins, even when they are
being used as analog inputs. The user
must ensure that the bits in the GPDDR
register are maintained set (input) when
using them as analog inputs.
Name
Bit
#
Function
GP0/AN0
bit0 I/O or analog input
GP1/AN1
bit1 I/O or analog input
GP2/AN2/PWM2
bit2 I/O, analog input
or PWM out
GP3/AN3/PWM3
bit3 I/O, analog input
or PWM out
GP4/VREF-
bit4 I/O or analog voltage
reference
GP5/VREF+
bit5 I/O or analog voltage
reference
GP6/CLKOUT
bit6 I/O or Clock output
GP7/nRST/VPP
bit7 Input, external reset input
or programming voltage
input
Note:
Refer to Section 7.4 “A/D Threshold
Detection” for information regarding A/D
channels.
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