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參數(shù)資料
| 型號(hào)： | PSD4235G2V-B-70MI |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Flash In-System-Programmable Peripherals for 16-Bit MCUs |
| 中文描述： | Flash在系統(tǒng)可編程外設(shè)的16位微控制器 |
| 文件頁數(shù)： | 44/93頁 |
| 文件大小： | 503K |
| 代理商： | PSD4235G2V-B-70MI |
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PSD4000 Series
Preliminary Information
46
The
PSD4000
Functional
Blocks
(cont.)
9.4 I/O Ports
There are seven programmable I/O ports: Ports A, B, C, D, E, F and G. Each of the ports
is eight bits except Port D, which is 4 bits. Each port pin is individually user configurable,
thus allowing multiple functions per port. The ports are configured using PSDsoft or by the
microcontroller writing to on-chip registers in the CSIOP address space.
The topics discussed in this section are:
General Port Architecture
Port Operating Modes
Port Configuration Registers
Port Data Registers
Individual Port Functionality.
9.4.1 General Port Architecture
The general architecture of the I/O Port is shown in Figure 20. Individual Port architectures
are shown in Figures 21 through 23. In general, once the purpose for a port pin has been
defined, that pin will no longer be available for other purposes. Exceptions will be noted.
As shown in Figure 20, the ports contain an output multiplexer whose selects are driven
by the configuration bits in the Control Registers (Ports E, F and G only) and PSDsoft
Configuration. Inputs to the multiplexer include the following:
t Output data from the Data Out Register
t Latched address outputs
t GPLD outputs (External Chip Selects)
The Port Data Buffer (PDB) is a tri-state buffer that allows only one source at a time to be
read. The PDB is connected to the Internal Data Bus for feedback and can be read by the
microcontroller. The Data Out and Micro
Cell outputs, Direction and Control Registers,
and port pin input are all connected to the PDB.
The contents of these registers can be altered by the microcontroller. The PDB feedback
path allows the microcontroller to check the contents of the registers.
9.4.2 Port Operating Modes
The I/O Ports have several modes of operation. Some modes can be defined using
PSDsoft, some by the microcontroller writing to the Registers in CSIOP space, and some
by both. The modes that can only be defined using PSDsoft must be programmed into the
device and cannot be changed unless the device is reprogrammed. The modes that can be
changed by the microcontroller can be done so dynamically at run-time. The PLD I/O,
Data Port, Address Input, and MCU Reset modes are the only modes that must be defined
before programming the device. All other modes can be changed by the microcontroller at
run-time.
Table 16 summarizes which modes are available on each port. Table 19 shows how and
where the different modes are configured. Each of the port operating modes are described
in the following subsections.
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| PSD4235G2V-B-70U | CAP 330UF 6V 20% TANT SMD-7343-31 TR-7-PL SN100% LOWESR-3500 |
| PSD4235G2V-B-70UI | Flash In-System-Programmable Peripherals for 16-Bit MCUs |
| PSD4235G2V-B-90B81 | CAP 330UF 6V 20% TANT SMD-7343-31 TR-7-PL SN100% LOWESR-0450 |
| PSD4235G2V-B-90B81I | Flash In-System-Programmable Peripherals for 16-Bit MCUs |
| PSD4235G2V-B-90J | Flash In-System-Programmable Peripherals for 16-Bit MCUs |
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