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SM59264 데이터시트(PDF) 9 Page - SyncMOS Technologies,Inc |
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SM59264 데이터시트(HTML) 9 Page - SyncMOS Technologies,Inc |
9 / 32 page May 2002 Specifications subject to change without notice,contact your sales representatives for the most recent information. 9/32 Ver 1.0 PID 59264 05/02 SyncMOS Technologies Inc. SM59264 With this bank mapping scheme, user can access entire 1k 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 1k byte on-chip RAM space which is selected by BS[3:0] 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[3:0] setting will map $040~$07F RAM space to entire 1k byte on-chip RAM space. bit-7 bit-0 Read: BSE Unused Unused Unused BS3 BS2 BS1 BS0 Write: Reset value: 0 * * * 0 0 0 1 BS3 BS2 BS1 BS0 040h~07fh map- ping address Note 0 0 0 0 000h~03fh lower 128 byte RAM 0 0 0 1 040h~07fh lower 128 byte RAM 0 0 1 0 080h~0bfh higher 128 byte RAM 0 0 1 1 0c0h~0ffh higher 128 byte RAM 0 1 0 0 0000h~003fh on-chip expanded 768 byte RAM 0 1 0 1 0040h~007fh “ 0 1 1 0 0080h~00bfh “ 0 1 1 1 00c0h~00ffh “ 1 0 0 0 0100h~013fh “ 1 0 0 1 0140h~017fh “ 1 0 1 0 0180h~01bfh “ 1 0 1 1 01c0h~01ffh “ 1 1 0 0 0200h~023fh “ 1 1 0 1 0240h~027fh “ 1 1 1 0 0280h~02bfh “ 1 1 1 1 02c0h~02ffh “ |
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