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| 型號： | VMX1C1020 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Versa Mix 8051 Mixed-Signal MCU |
| 中文描述： | 反之亦然混合8051混合信號微控制器 |
| 文件頁數(shù)： | 13/80頁 |
| 文件大小： | 3605K |
| 代理商： | VMX1C1020 |
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VMX51C1020
General Purpose I/O
_________________________________________________________________________________________________
www.ramtron.com
page 13 of 80
The VMX51C1020 provides 28 general-purpose
I/O pins. The I/Os are shared with digital
peripherals and can be configured individually.
At Reset, all the VMX51C1020 I/O ports are
configured as Inputs
The I/O Ports are bi-directional and the CPU can
write or read data through any of these ports.
I/O Port Structure
The VMX51C1020 I/O port structure is shown in
the following figure.
F
IGURE
9
–
I/O
PORT STRUCTURE
I/O
TTL
Driver
OE
VCC
VCC
I/O
Control
logic
Each
(represented by the internal pull-up resistor) and
a pair of internal protection diodes connected to
VCC and ground, providing ESD protection.
The I/O operational configuration is defined in
the I/O control logic block.
I/O Port Drive Capability
I/O
pin
includes
pull-up
circuitry
Each I/O port pin, when configured as an output
is able to source or sink up to 4mA. The
following graphs show typical I/O output voltage
vs. source and I/O output voltage versus sink
current.
F
IGURE
10:
T
YPICAL
I/O
V
OUT VS
.
SOURCE CURRENT
I
I/O current source (mA)
4.50
4.60
4.70
4.80
4.90
5.00
0.0
2.0
4.0
6.0
8.0
10.0
F
IGURE
11:
T
YPICAL
I/O
V
OUT VS
.
SINK CURRENT
I
I/O current sink (mA)
0.00
0.10
0.20
0.30
0.40
0.50
0.0
2.0
4.0
6.0
8.0
10.0
The maximum recommended driving current of a
single I/O on a given port is 10mA. The
recommended limit when more than one I/O on
I/O. The total current drive of all I/O ports should
be limited to 40mA
The following figure shows typical I/O rise time
when driving a 20pF capacitive load. In this
case, rise time is about 14ns.
F
IGURE
12:
I/O
R
ISE
T
IME WITH A
20
P
F
L
OAD
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