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XA-G39 Datasheet(PDF) 12 Page - NXP Semiconductors |
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XA-G39 Datasheet(HTML) 12 Page - NXP Semiconductors |
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12 / 42 page 
Philips Semiconductors Preliminary data XA-G39 XA 16-bit microcontroller family 32K Flash/1K RAM, watchdog, 2 UARTs 2002 Mar 13 12 VDD SUPPLY OR +12V ±5% 5V ±5% TxD RxD VSS VPP VDD TxD RxD RST XTAL2 XTAL1 SU01593 VSS VCC 2 3 5 FEMALE DB-9 RS-232 TRANSCEIVER MC145406, MAX232, OR EQUIVALENT FOR USE WITH WINISP OR FLASHMAGIC Figure 4. In-System Programming with a Minimum of Pins In-System Programming (ISP) In-System Programming (ISP) is performed without removing the microcontroller from the system. The In-System Programming (ISP) facility consists of a series of internal hardware resources coupled with internal firmware to facilitate remote programming of the XA-G39 through the serial port. This firmware is provided by Philips and embedded within each XA-G39 device. The Philips In-System Programming (ISP) facility has made in-circuit programming in an embedded application possible with a minimum of additional expense in components and circuit board area. The ISP function uses five pins: TxD, RxD, VSS, VDD, and VPP (see Figure 4). Only a small connector needs to be available to interface your application to an external circuit in order to use this feature. The VPP supply should be adequately decoupled and VPP not allowed to exceed datasheet limits. VCC VPP OSC FREQ IDD 5.0 V 5.0 V 22 MHz 75 mA typical 5.0 V 5.0 V 30 MHz 90 mA typical ISP increases IDD by less than 1mA. Free ISP software is available on the Philips web site: “WinISP” 1. Direct your browser to the following page: http://www.semiconductors.com/mcu/download/80C51/flash/ 2. Download “WinISP.exe” 3. Execute WinISP.exe to install the software Free ISP software is also available from the Embedded Systems Academy: “FlashMagic” 1. Direct your browser to the following page: http://www.esacademy.com/software/flashmagic/ 2. Download Flashmagic 3. Execute “flashmagic.exe” to install the software There is also an application note available that deals with In-System Programming (AN716). At www.philipsmcu.com, search for “ISP”, then select AN716 from the search results. Using In-System Programming (ISP) ISP mode is entered by holding PSEN low, asserting, un-asserting RESET, then releasing PSEN. When ISP mode is entered, the default loader first disables the watchdog timer to prevent a watchdog reset from occurring during programming. The ISP feature allows for a wide range of baud rates to be used in the application, independent of the oscillator frequency. It is also adaptable to a wide range of oscillator frequencies. This is accomplished by measuring the bit-time of a single bit in a received character. This information is then used to program the baud rate in terms of timer counts based on the oscillator frequency. The ISP feature requires that an initial character (a lowercase f) be sent to the XA-G39 to establish the baud rate. The ISP firmware provides auto-echo of received characters. Once baud rate initialization has been performed, the ISP firmware will only accept specific Intel Hex-type records. Intel Hex records consist of ASCII characters used to represent hexadecimal values and are summarized below: :NNAAAARRDD..DDCC<crlf> In the Intel Hex record, the “NN” represents the number of data bytes in the record. The XA-G39 will accept up to 16 (10H) data bytes. The “AAAA” string represents the address of the first byte in the record. If there are zero bytes in the record, this field is often set to 0000. The “RR” string indicates the record type. A record type of “00” is a data record. A record type of “01” indicates the end-of-file mark. In this application, additional record types will be added to indicate either commands or data for the ISP facility. The maximum number of data bytes in a record is limited to 16 (decimal). ISP commands are summarized in Table 1. As a record is received by the XA-G39, the information in the record is stored internally and a checksum calculation is performed. The |
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