参数资料
| 型号： | T89C51CC01UA-SLSIM |
| 厂商： | Atmel |
| 文件页数： | 26/123页 |
| 文件大小： | 0K |
| 描述： | IC 8051 MCU FLASH 32K 44PLCC |
| 标准包装： | 27 |
| 系列： | AT89C CAN |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 40MHz |
| 连通性： | CAN，UART/USART |
| 外围设备： | POR，PWM，WDT |
| 输入/输出数： | 32 |
| 程序存储器容量： | 32KB（32K x 8） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 2K x 8 |
| RAM 容量： | 1.25K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 3 V ~ 5.5 V |
| 数据转换器： | A/D 8x10b |
| 振荡器型： | 外部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 44-LCC（J 形引线） |
| 包装： | 管件 |
| 配用： | AT89STK-06-ND - KIT DEMOBOARD 8051 MCU W/CAN |
| 其它名称： | T89C51CC01UASLSIM |
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2010 Microchip Technology Inc.
DS41303G-page 121
PIC18F2XK20/4XK20
10.0
I/O PORTS
Depending on the device selected and features
enabled, there are up to five ports available. Some pins
of the I/O ports are multiplexed with an alternate
function from the peripheral features on the device. In
general, when a peripheral is enabled, that pin may not
be used as a general purpose I/O pin.
Each port has three registers for its operation. These
registers are:
TRIS register (data direction register)
PORT register (reads the levels on the pins of the
device)
LAT register (output latch)
The Data Latch (LAT register) is useful for read-modify-
write operations on the value that the I/O pins are
driving.
A simplified model of a generic I/O port, without the
interfaces to other peripherals, is shown in Figure 10-1.
FIGURE 10-1:
GENERIC I/O PORT
OPERATION
10.1
PORTA, TRISA and LATA
Registers
PORTA is an 8-bit wide, bidirectional port. The
corresponding data direction register is TRISA. Setting
a TRISA bit (= 1) will make the corresponding PORTA
pin an input (i.e., disable the output driver). Clearing a
TRISA bit (= 0) will make the corresponding PORTA
pin an output (i.e., enable the output driver and put the
contents of the output latch on the selected pin).
Reading the PORTA register reads the status of the
pins, whereas writing to it, will write to the PORT latch.
The Data Latch (LATA) register is also memory mapped.
Read-modify-write operations on the LATA register read
and write the latched output value for PORTA.
The RA4 pin is multiplexed with the Timer0 module
clock input and one of the comparator outputs to
become the RA4/T0CKI/C1OUT pin. Pins RA6 and
RA7 are multiplexed with the main oscillator pins; they
are enabled as oscillator or I/O pins by the selection of
the main oscillator in the Configuration register (see
Section 23.1 “Configuration Bits” for details). When
they are not used as port pins, RA6 and RA7 and their
associated TRIS and LAT bits are read as ‘0’.
The other PORTA pins are multiplexed with analog
inputs, the analog VREF+ and VREF- inputs, and the
comparator voltage reference output. The operation of
pins RA<3:0> and RA5 as analog is selected by setting
the ANS<4:0> bits in the ANSEL register which is the
default setting after a Power-on Reset.
Pins RA0 through RA5 may also be used as comparator
inputs or outputs by setting the appropriate bits in the
CM1CON0 and CM2CON0 registers.
The RA4/T0CKI/C1OUT pin is a Schmitt Trigger input.
All other PORTA pins have TTL input levels and full
CMOS output drivers.
The TRISA register controls the drivers of the PORTA
pins, even when they are being used as analog inputs.
The user should ensure the bits in the TRISA register
are maintained set when using them as analog inputs.
EXAMPLE 10-1:
INITIALIZING PORTA
Data
Bus
WR LAT
WR TRIS
RD Port
Data Latch
TRIS Latch
RD TRIS
Input
Buffer
I/O pin(1)
Q
D
CK
Q
D
CK
EN
QD
EN
RD LAT
or Port
Note 1:
I/O pins have diode protection to VDD and VSS.
Note:
On a Power-on Reset, RA5 and RA<3:0>
are configured as analog inputs and read
as ‘0’. RA4 is configured as a digital input.
CLRF
PORTA
; Initialize PORTA by
; clearing output
; data latches
CLRF
LATA
; Alternate method
; to clear output
; data latches
MOVLW
E0h
; Configure I/O
MOVWF
ANSEL
; for digital inputs
MOVLW
0CFh
; Value used to
; initialize data
; direction
MOVWF
TRISA
; Set RA<3:0> as inputs
; RA<5:4> as outputs
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