參數(shù)資料
型號： W78IRD2
廠商： WINBOND ELECTRONICS CORP
元件分類： 8位微控制器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁數(shù)： 6/76頁
文件大?。?/td> 646K
代理商： W78IRD2
W78IRD2/W78IRD2A
- 6 -
5. FUNCTIONAL DESCRIPTION
The W78IRD2 architecture consists of a core processor that supports 111 different op-codes and
references 64 KB of program space and 64 KB of data space. It is surrounded by various registers;
four general-purpose I/O ports; one special-purpose, programmable, 4-bit I/O port; 256 bytes of RAM;
1 KB of auxiliary RAM (AUX-RAM); three timer/counters; a serial port; and an internal 74373 latch and
74244 buffer which can be switched to port 2.
This section introduces the RAM, Timers/Counters, Clock, Power Management, Reduce EMI
Emission, and Reset.
5.1 RAM
The W78IRD2 has two banks of RAM: 256 bytes of RAM and 1 KB of AUX-RAM. AUX-RAM is
enabled by clearing bit 1 in the AUXR register, and it is enabled after reset. Different addresses in
RAM are addressed in different ways.
RAM 00H
7FH can be addressed directly or indirectly, as in the 8051. The address pointers are R0
and R1 of the selected bank.
RAM 80H
FFH can only be addressed indirectly, as in the 8051. The address pointers are R0 and
R1 of the selected bank.
AUX-RAM 00H
3FFH is addressed indirectly in the same way external data memory is accessed
with the MOVX instruction. The address pointers are R0 and R1 of the selected bank and the DPTR
register.
Addresses higher than 3FFH are stored in external memory and are accessed indirectly with the
MOVX instruction, as in the 8051.
When AUX-RAM is enabled, the instruction "MOVX @Ri" always accesses AUX-RAM. When the
W78IRD2 is executing instructions from internal program memory, accessing AUX-RAM does not
affect ports P0, P2,
WR
or
RD
.
For example,
ANL AUXR,#11111101B ; Enable AUX-RAM
MOV DPTR,#1234H
MOV A,#56H
MOVX @DPTR,A ; Write 56h to address 1234H in external memory
MOV XRAMAH,#02H ; Only 2 LSB effective
MOV R0,#34H
MOV A,@R0 ; Read AUX-RAM data at address 0234H
5.2 Timers/Counters
The W78IRD2 has three timers/counters called Timer 0, Timer 1, and Timer 2. Each timer/counter
consists of two 8-bit data registers: TL0 and TH0 for Timer 0, TL1 and TH1 for Timer 1, and TL2 and
TH2 for Timer 2.
The operations of Timer 0 and Timer 1 are similar to those in the W78C52, and these timers are
controlled by the TCON and TMOD registers.
Timer 2 is controlled by the T2CON register. Like Timers 0 and 1, Timer 2 can operate as either an
external event counter or an internal timer, depending on the setting of bit C/T2 in T2CON. Timer 2
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相關代理商/技術參數(shù)
參數(shù)描述
W78IRD2A 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
W78IRD2A25DL 功能描述:IC MCU 8-BIT 64K FLASH 40-DIP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W78 標準包裝:300 系列:78K0R/Ix3 核心處理器:78K/0R 芯體尺寸:16-位 速度:40MHz 連通性:3 線 SIO，I²C，LIN，UART/USART 外圍設備:DMA，LVD，POR，PWM，WDT 輸入/輸出數(shù):27 程序存儲器容量:16KB（16K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:38-SSOP 包裝:托盤
W78IRD2A25PL 功能描述:IC MCU 8-BIT 64K FLASH 44-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W78 標準包裝:300 系列:78K0R/Ix3 核心處理器:78K/0R 芯體尺寸:16-位 速度:40MHz 連通性:3 線 SIO，I²C，LIN，UART/USART 外圍設備:DMA，LVD，POR，PWM，WDT 輸入/輸出數(shù):27 程序存儲器容量:16KB（16K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:38-SSOP 包裝:托盤
W78J_1TG WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
W78J_2G WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
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