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DS2250T-64-16 Datasheet(PDF) 8 Page - Dallas Semiconductor |
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DS2250T-64-16 Datasheet(HTML) 8 Page - Dallas Semiconductor |
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8 / 19 page  DS2250(T) 121395 8/19 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 1 X X 1 0 0 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 load ing. 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 ad- dress must be presented at Ports 1 and 2 as in the nor- mal 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 initializa- tion 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. A typical parallel loading session would follow this pro- cedure. First, set the contents of the MCON register with the correct range and partition only if using expand- ed programming cycles. Next, the encryption registers can be loaded to enable encryption of the program/data memory (not required). Then, program the DS2250(T) using either normal or expanded program cycles and check the memory contents using Verify cycles. The last operation would be to turn on the security lock fea- ture by either a Security Set cycle or by explicitly writing to the MCON register and setting MCON.0 to a 1. |
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