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參數(shù)資料
| 型號(hào)： | 73S1215F-68IM/F |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 100/136頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC SMART CARD READER 68-QFN |
| 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(lèi)型： | 閃存 |
| RAM 容量： | 2K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 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(pán) |
| 包裝： | 管件 |
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73S1215F Data Sheet
DS_1215F_003
66
Rev. 1.4
32768Hz crystal or the 12MHz crystal. The selection of the clock source is made external to this block,
by setting bit 3 – 32KBEN – in the MCLKCtl register (see the oscillator and clock generation section).
Disabling the 32kHz oscillator will source the 1kHz clock from the 12MHz main oscillator and divide it
down. Setting bit 6 – KBEN – in the MCLKCtl register will enable keypad scanning and debouncing. The
keypad size can be adjusted within the KSIZE register.
Normal scanning is performed by hardware when the bit SCNEN is set at 1 in the KSTAT register. Figure
13 shows the flowchart of how the hardware scanning operates. In order to minimize power, scanning
does not occur until a key-press is detected. Once hardware key scanning is enabled, the hardware
drives all column outputs low and waits for a low to be detected on one of the inputs. When a low is
detected on any row, and before key scanning starts, the hardware checks that the low level is still
detected after a debounce time. The debounce time is defined by firmware in the KSCAN register (bits
7:0, DBTIME). Debounce times from 4ms to 256ms in 4ms increments are supported. If a key is not
pressed after the debounce time, the hardware will go back to looking for any input to be low. If a key is
confirmed to be pressed, key scanning begins.
Key scanning asserts one of the 5 drive lines (COL 4:0) low and looks for a low on a sense line indicating
that a key is pressed at the intersection of the drive/sense line in the keypad. After all sense lines have
been checked without a key-press being detected, the next column line is asserted. The time between
checking each sense line is the scan time and is defined by firmware in the KSCAN register (bits 0:1 –
SCTIME). Scan times from 1ms to 4ms are supported. Scanning order does not affect the scan time.
This scanning continues until the entire keypad is scanned. If only one key is pressed, a valid key is
detected. Simultaneous key presses are not considered as valid (If two keys are pressed, no key is
reported to firmware).
registers that define the order of column scanning. Values in these registers must be updated every time
a new keyboard scan order is desired. It is not possible to change the order of scanning the sense lines.
The column and row intersection for the detected valid key are stored in the KCOL and KROW registers.
When a valid key is detected, an interrupt is generated. Firmware can then read those registers to
after a valid key has been identified. The hardware does not wait for the firmware to service the interrupt
in order to proceed with the key scanning process. Once the valid key (or invalid key – e.g. two keys
pressed) is detected, the hardware waits for the key to be released. Once the key is released, the
debounce timer is started. If the key is not still released after the debounce time, the debounce counter
starts again. After a key release, all columns will be driven low as before and the process will repeat
waiting for any key to be pressed.
When the SCNEN bit is disabled, all drive outputs are set to the value in the KCOL register. If firmware
clears the SCNEN bit in the middle of a key scan, the KCOL register contains the last value stored in
there which will then be reflected on the output pins.
A bypass mode is provided so that the firmware can do the key scanning manually (SCNEN bit must be
cleared). In bypass mode, the firmware writes/reads the Column and Row registers to perform the key
scanning.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 73S1215F68IMLV1.15 | 制造商:Maxim Integrated Products 功能描述:8-bit Microcontrollers - MCU 80515 SoC w/USB & PINpad |
| 73S1215F-68IMR/F | 功能描述:8位微控制器 -MCU 80515 SoC w/USB & PINpad RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| 73S1215F-68IMR/F/P | 功能描述:IC SMART CARD READER PROG 68-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:73S12xx 產(chǎn)品培訓(xùn)模塊:MCU Product Line Introduction AVR® UC3 Introduction 標(biāo)準(zhǔn)包裝:2,500 系列:AVR®32 UC3 B 核心處理器:AVR 芯體尺寸:32-位 速度:60MHz 連通性:I²C，IrDA，SPI，SSC，UART/USART，USB 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，DMA，POR，PWM，WDT 輸入/輸出數(shù):28 程序存儲(chǔ)器容量:128KB（128K x 8） 程序存儲(chǔ)器類(lèi)型:閃存 EEPROM 大小:- RAM 容量:32K x 8 電壓 - 電源 (Vcc/Vdd):1.65 V ~ 1.95 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TQFP 包裝:帶卷 (TR) 配用:ATSTK600-TQFP48-ND - STK600 SOCKET/ADAPTER 48-TQFPATAVRONEKIT-ND - KIT AVR/AVR32 DEBUGGER/PROGRMMRATEVK1101-ND - KIT DEV/EVAL FOR AVR32 AT32UC3B 其它名稱(chēng):AT32UC3B1128-AUR-NDAT32UC3B1128-AURTR |
| 73S1215F-EB | 功能描述:開(kāi)發(fā)板和工具包 - 8051 73S1215F Eval Brd (USD Cbl, Doc. Cd) RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)估:C8051F960, Si7005 核心: 接口類(lèi)型:USB 工作電源電壓: |
| 73S1215F-EB-Lite | 功能描述:開(kāi)發(fā)板和工具包 - 8051 73S1215F Eval Brd Lite (USD Cbl, D.Cd) RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)估:C8051F960, Si7005 核心: 接口類(lèi)型:USB 工作電源電壓: |
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