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參數(shù)資料
| 型號： | 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： | 存儲器高速微與A / D及PWM（帶A / D轉(zhuǎn)換和脈寬調(diào)制的存儲器/ ROM的高速微控制器） |
| 文件頁數(shù)： | 17/27頁 |
| 文件大?。?/td> | 119K |
| 代理商： | DS87C550 |
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APPLICATION NOTE 78
030998 17/27
; to mail loop to await next command.
INVALID: MOV SBUF0, #ERR_CHAR ;An invalid command has been received.
CALL RING_ENA ;Return to ring oscillator and clear the
JMP CLR_BUF ; command buffer. This will also be called
; intentionally by the originator to return
; the device to the ring oscillator.
;***************************************************************************
;SER0_INT – This ISR handles serial port 0 interrupts. Receiver interrupts
; will be caused by receipt of a command byte from the originator.
; The byte will then be echoed back to confirm receipt.
;
; Transmitter interrupts are called by the transmission of data
; or a status character to the originator.
;***************************************************************************
SER0_INT: JB TI_0, XMIT_INT ;Determine source of interrupt.
MOV R0, SBUF0 ;Interrupt was serial reception. Save command
CLR RI_0 ; byte in R0 for main program loop and clear
; receiver interrupt flag.
MOV SBUF0, R0 ;Echo data to acknowledge receipt.
RETI
XMIT_INT: CLR TI_0 ;Interrupt was caused by transmitter. Clear
RETI ; interrupt flag and return.
;***************************************************************************
;EXT_INT1 – This ISR restarts the crystal in response to a falling edge
; on the INT0 pin, which is also tied to the serial port 0 RX pin.
; When crystal has stabilized, it sends a ready signal to the originator.
; Further INT1s are disabled until the data has been received to prohibit
; data bits from being mistaken as start bits.
;***************************************************************************
EXT_INT1: CLR EX1 ;Disable any more serial restart interrupts
CALL XTAL_ENA ;Start crystal oscillator
MOV SBUF0, #RDY_CHAR ;Send Ready signal
CLR RI_0 ;Any serial port receiver interrupts at this
; point are erroneous, so ignore them.
RETI
;***************************************************************************
;XTAL_ENA – This subroutine checks to see if the crystal is running, and if
; not, enables it and waits until it has stabilized.
;***************************************************************************
XTAL_ENA: PUSH ACC ;Save accumulator
ANL PMR, #0F7h ;Clear XTOFF bit to restart crystal.
XTALWAIT: MOV A, STATUS ;Check XTUP: Loop until crystal has stabilized.
JNB ACC.4, XTALWAIT
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS87C550-FCL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM |
| DS87C550-FNL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM |
| DS87C550-KCL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM |
| DS87C550-QCL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM |
| 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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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 外圍設備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲器容量:64KB（64K x 8） 程序存儲器類型: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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