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| 型号： | ST10F269Z2Q6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP144 |
| 封装： | 28 X 28 MM, PLASTIC, QFP-144 |
| 文件页数： | 144/184页 |
| 文件大小： | 3276K |
| 代理商： | ST10F269Z2Q6 |
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12 - PARALLEL PORTS
ST10F269
62/184
12.2.4 - Alternate Port Functions
Each port line has one associated programmable
alternate input or output function.
– PORT0 and PORT1 may be used as address
and data lines when accessing external memory.
– Port 2, Port 7 and Port 8 are associated with the
capture inputs or compare outputs of the CAP-
COM units and/or with the outputs of the PWM
module.
Port 2 is also used for fast external interrupt in-
puts and for timer 7 input.
– Port 3 includes the alternate functions of timers,
serial interfaces, the optional bus control signal
BHE and the system clock output (CLKOUT).
– Port 4 outputs the additional segment address
bit A16 to A23 in systems where segmentation
is enabled to access more than 64K Bytes of
memory.
– Port 5 is used as analog input channels of the
A/D converter or as timer control signals.
– Port 6 provides optional bus arbitration signals
(BREQ, HLDA, HOLD) and chip select signals.
If an alternate output function of a pin is to be
used,
the
direction
of
this
pin
must
be
programmed for output (DPx.y=‘1’), except for
some signals that are used directly after reset and
are configured automatically. Otherwise the pin
remains in the high-impedance state and is not
effected by the alternate output function. The
respective port latch should hold a ‘1’, because its
output is ANDed with the alternate output data
(except for PWM output signals).
If an alternate input function of a pin is used, the
direction of the pin must be programmed for input
(DPx.y=‘0’) if an external device is driving the pin.
The input direction is the default after reset. If no
external device is connected to the pin, however,
one can also set the direction for this pin to output.
In this case, the pin reflects the state of the port
output latch. Thus, the alternate input function
reads the value stored in the port output latch.
This can be used for testing purposes to allow a
software trigger of an alternate input function by
writing to the port output latch.
On most of the port lines, the application software
must set the proper direction when using an
alternate input or output function of a pin. This is
done by setting or clearing the direction control bit
DPx.y of the pin before enabling the alternate
function. There are port lines, however, where the
direction of the port line is switched automatically.
For instance, in the multiplexed external bus
modes of PORT0, the direction must be switched
several times for an instruction fetch in order to
output the addresses and to input the data.
Obviously,
this
cannot
be
done
through
instructions. In these cases, the direction of the
port line is switched automatically by hardware if
the alternate function of such a pin is enabled.
To determine the appropriate level of the port
output latches check how the alternate data
output is combined with the respective port latch
output.
There is one basic structure for all port lines
supporting only one alternate input function. Port
lines with only one alternate output function,
however, have different structures. It has to be
adapted to support the normal and the alternate
function features.
All port lines that are not used for these alternate
functions may be used as general purpose I/O
lines. When using port pins for general purpose
output, the initial output value should be written to
the port latch prior to enabling the output drivers,
in order to avoid undesired transitions on the
output pins. This applies to single pins as well as
to pin groups (see examples below).
SINGLE_BIT: BSET
P4.7
; Initial output level is "high"
BSET
DP4.7
; Switch on the output driver
BIT_GROUP:
BFLDH
P4, #24H, #24H
; Initial output level is "high"
BFLDH
DP4, #24H, #24H
; Switch on the output drivers
Note: When using several BSET pairs to control more pins of one port, these pairs must be separated by
instructions, which do not apply to the respective port (See Chapter : Central Processing Unit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST10F269Z2Q6/TR | 功能描述:16位微控制器 - MCU 16B MCU 256K Byte and 12K Byte RAM RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT |
| ST10F269Z2QX | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:16-BIT MCU WITH MAC UNIT, 256K BYTE FLASH MEMORY AND 12K BYTE RAM |
| ST10F269Z2T3 | 功能描述:16位微控制器 - MCU ST10F272 16B MCU RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT |
| ST10F269Z2T6 | 功能描述:16位微控制器 - MCU ST10F272 16B MCU RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT |
| ST10F269ZX | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:16-BIT MCU WITH MAC UNIT, 128K to 256K BYTE FLASH MEMORY AND 12K BYTE RAM |
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