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| 型號： | 73S1217F-68MR/F/PE |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 35/140頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SOC SMART CARD READER 68QFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
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DS_1217F_002
73S1217F Data Sheet
Rev. 1.2
13
Table 3: Flash Special Function Registers
Register
SFR
Address
R/W
Description
ERASE
0x94
W
This register is used to initiate either the Flash Mass Erase cycle or the
Flash Page Erase cycle. Specific patterns are expected for ERASE in
order to initiate the appropriate Erase cycle (default = 0x00).
0x55 – Initiate Flash Page Erase cycle. Must be proceeded by a write
to PGADDR @ SFR 0xB7.
0xAA – Initiate Flash Mass Erase cycle. Must be proceeded by a write
to FLSH_MEEN @ SFR 0xB2 and the debug port must be
enabled.
Any other pattern written to ERASE will have no effect.
PGADDR
0xB7
R/W
Flash Page Erase Address register containing the flash memory page
address (page 0 through 127) that will be erased during the Page Erase
cycle (default = 0x00). Note: the page address is shifted left by one bit
(see detailed description above).
Must be re-written for each new Page Erase cycle.
FLSHCTL
0xB2
R/W
Bit 0 (FLSH_PWE): Program Write Enable:
0 – MOVX commands refer to XRAM Space, normal operation (default).
1 – MOVX @DPTR,A moves A to Program Space (Flash) @ DPTR.
This bit is automatically reset after each byte written to flash. Writes to
this bit are inhibited when interrupts are enabled.
W
Bit 1 (FLSH_MEEN): Mass Erase Enable:
0 – Mass Erase disabled (default).
1 – Mass Erase enabled.
Must be re-written for each new Mass Erase cycle.
R/W
Bit 6 (SECURE):
Enables security provisions that prevent external reading of flash
memory and CE program RAM. This bit is reset on chip reset and may
only be set. Attempts to write zero are ignored.
Internal Data Memory: The internal data memory provides 256 bytes (0x00 to 0xFF) of data memory.
The internal data memory address is always one byte wide and can be accessed by either direct or
indirect addressing. The Special Function Registers occupy the upper 128 bytes. This SFR area is
available only by direct addressing. Indirect addressing accesses the upper 128 bytes of Internal
RAM.
The lower 128 bytes contain working registers and bit-addressable memory. The lower 32 bytes form
four banks of eight registers (R0-R7). Two bits on the program memory status word (PSW) select which
bank is in use. The next 16 bytes form a block of bit-addressable memory space at bit addresses 0x00-
0x7F. All of the bytes in the lower 128 bytes are accessible through direct or indirect addressing. Table 4
shows the internal data memory map.
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