參數(shù)資料
型號(hào)： DS87C550
廠商： Maxim Integrated Products, Inc.
英文描述： EPROM High-Speed Micro with A/D and PWM(帶 A/D 和 PWM的EPROM/ROM高速微控制器)
中文描述： 存儲(chǔ)器高速微與A / D及PWM（帶A / D轉(zhuǎn)換和脈寬調(diào)制的存儲(chǔ)器/ ROM的高速微控制器）
文件頁數(shù)： 22/27頁
文件大?。?/td> 119K
代理商： DS87C550
APPLICATION NOTE 78
030998 22/27
ORL EXIF, #02h ;Enable restart from ring.
ORL PMR, #08h ;Disable crystal.
ORL PCON, #02h ;Set the STOP bit to halt the device.
JMP MAIN ;End of main program loop
;***************************************************************************
;SER_INT0 – This ISR handles serial port 0 interrupts. Serial port interrupts
; will only be possible when the device is ”active” following a
; keypress. The primary function of this interrupt is to transmit
; the next character in the table until all data has been sent.
;***************************************************************************
SER_INT0: JB TI_0,XMIT_INT ;Test for transmit or receive interrupt.
CLR RI_0 ;This example does not receive serial data.
RETI ; This code is included for completeness.
XMIT_INT: CLR TI_0 ;Clear transmit interrupt and send next byte.
MOV A, DPL1 ;Check to see if we are at the end of the
CJNE A, DPL, NOT_END ; data. If DPTR0 and DPTR1 are same, then
MOV A, DPH1 ; then all the data has been sent.
CJNE A, DPH, NOT_END
SETB F0 ;We have reached the end of the table.
RETI ; Set completion flag and exit.
NOT_END: PUSH DPS ;Preserve current data pointer.
MOV DPS, #01h ;Switch to DPTR1 to track data pointer.
MOVX A, @DPTR ;We still have data, so transmit it, restore
MOV SBUF0, A ; data pointer, and return to send next byte.
POP DPS
RETI
;***************************************************************************
;EXT_INT1 – This ISR is generated by activity on a keypad. It causes the
; device to read a command on Port 0 and take the appropriate action.
; This simple example performs two functions:
; 1. Download stored data to host through serial port 0.
; 2. Clear the data table by resetting the data pointer.
; If the command is to download stored data, it will switch to the
; crystal first. The F0 flag is used to indicate when all the data
; has been sent. This prevents the software from exiting the ISR
; and reentering Stop mode before all the data has been transmitted.
;***************************************************************************
EXT_INT1: ANL PMR, #0F7h ;Enable crystal for possible serial activity.
MOV A, P0 ;Read the data on Port 0 and take
CJNE A, #00h, CHECK_2 ; appropriate action.
JMP DNLOAD
CHECK_2: CJNE A, #01h, INVALID
CLEAR: MOV DPTR, #DATA_TABLE ;Zero all of on–chip SRAM space from 0–3FFh.
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DS87C550-QCL+ 功能描述:IC MCU EPROM ADC/PWM HS 68-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:87C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件
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