Electronic Components Datasheet Search |
|
DS2250T-8-16 Datasheet(PDF) 8 Page - Dallas Semiconductor |
|
DS2250T-8-16 Datasheet(HTML) 8 Page - Dallas Semiconductor |
8 / 20 page DS2250(T) 8 of 20 COMMAND FUNCTION C Return CRC-16 checksum of embedded RAM D Dump Intel hex File F Fill embedded RAM block with constant K Load 40-bit encryption key L Load Intel hex file R Read MCON register T Trace (Echo) incoming Intel hex data U Clear Security Lock V Verify Embedded RAM with incoming Intel hex W Write MCON register Z Set security lock P Put a value to a port G Get a value from a port Table 1 summarizes the selection of the available Parallel Program Load cycles. The timing associated with these cycles is illustrated in the electrical specs. PARALLEL PROGRAM LOAD CYCLES Table 1 MODE RST PSEN PROG EA P2.7 P2.6 P2.5 Program 1 0 0 VPP 10 X Security Set 1 0 0 VPP 11 X Verify 1X X 1 00 X Prog Expanded 1 0 0 VPP 01 0 Verify Expanded 1 0 1 1 0 1 0 Prog MCON or Key registers 1 0 0 VPP 01 1 Verify MCON registers 1 0 1 1 0 1 1 The Parallel Program cycle is used to load a byte of data into a register or memory location within the DS2250(T). The Verify cycle is used to read this byte back for comparison with the originally loaded value to verify proper loading. The Security Set cycle may be used to enable and the software security feature. One may also enter bytes for the MCON register or for the five encryption registers using the Program MCON cycle. When using this cycle, the absolute register address must be presented at Ports 1 and 2 as in the normal program cycle (Port 2 should be 00H). The MCON contents can likewise be verified using the Verify MCON cycle. When the DS2250(T) first detects a Parallel Program Strobe pulse or a Security Set Strobe pulse while in the Program Load Mode following a power-on reset, the internal hardware of the device is initialized so that an existing 4-kbyte program can be programmed into a DS2250(T) with little or no modification. This initialization automatically sets the range address for 8 kbytes and maps the lowest 4-kbyte bank of embedded RAM as program memory. The next 4 kbytes of embedded RAM are mapped as data memory. In order to program more than 4 kbytes of program code, the Program/Verify Expanded cycles can be used. Up to 32 kbytes of program code can be entered and verified. Note that the expanded 32 kbyte Program/Verify cycles take much longer than the normal 4 kbyte Program/Verify cycles. |
Similar Part No. - DS2250T-8-16 |
|
Similar Description - DS2250T-8-16 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |