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SM79164V16J Scheda tecnica(PDF) 9 Page - SyncMOS Technologies,Inc |
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SM79164V16J Scheda tecnica(HTML) 9 Page - SyncMOS Technologies,Inc |
9 / 25 page Specifications subject to change without notice,contact your sales representatives for the most recent information. 9/26 Ver 2.1 SM79164 08/2006 SyncMOS Technologies International. Inc. SM79164 With this bank mapping scheme, user can access entire 4k byte on-chip RAM with direct addressing method. That means using the window area ($040~$07F), user can access any bank (64 byte) data of 4k byte on-chip RAM space which is selected by BS[5:0] of data bank control register (DBANK, $86). For example, user write #30h to $101 address: MOV DBANK, #88H ; set bank mapping $040~$07f to $0100~$013f MOV A, #30H ; store #30H to A MOV 41H, A ; write #30H to $0101 address Data Bank Control Register (DBANK, $86) Data bank select enable bit BSE = 1 enables the data bank select function Data bank select enable bit BSE = 0 disables the data bank select function BS[5:0] setting will map $040~$07F RAM space to entire 4k byte on-chip RAM space. Internal RAM Control Register (RCON, $85) SM79164 has 3840 byte on-chip RAM which can be accessed by external memory addressing method only. (By instruction MOVX). The address space of instruction MOVX @Rn is determined by bit 3, bit2, bit1, bit 0 (RAMS3, RAMS2, RAMS1, RAMS0) of RCON. The default setting of RAMS3, RAMS2, RAMS1, RAMS0 bits is 0000 (page0). bit-7 bit-0 BSE Unused BS5 BS4 BS3 BS2 BS1 BS0 Read / Write: R/W - R/W R/W R/W R/W R/W R/W Reset value: 0 * 000001 bit-7 bit-0 Unused Unused Unused Unused RAMS3 RAMS2 RAMS1 RAMS0 Read / Write: ---- R/W R/W R/W R/W Reset value: **** 0000 |
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