MSM80C154S/83C154S/85C154HVS64Table 4-4 Bit designation tableBit nameBit 0Bit 1Bit 2Bit 3Bit 4Bit 5Bit 6Bit 7b2 b1 b00 0 00 0 10 1 00 1 11 0 01 0 11 1 01 1 1Table 4-5 Addressing combination tableb7 b6 b5 b4 b3 RAM address0 0 0 0 0 0 20H 321 0 0 0 0 1 21H 332 0 0 0 1 0 22H 343 0 0 0 1 1 23H 354 0 0 1 0 0 24H 365 0 0 1 0 1 25H 376 0 0 1 1 0 26H 387 0 0 1 1 1 27H 398 0 1 0 0 0 28H 409 0 1 0 0 1 29H 41A 0 1 0 1 0 2AH 42B 0 1 0 1 1 2BH 43C 0 1 1 0 0 2CH 44D 0 1 1 0 1 2DH 45E 0 1 1 1 0 2EH 46F 0 1 1 1 1 2FH 47