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MSM64424-XXXGS-K Datasheet(PDF) 8 Page - OKI electronic componets |
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MSM64424-XXXGS-K Datasheet(HTML) 8 Page - OKI electronic componets |
8 / 13 page 8/13 ¡ Semiconductor MSM64422/64424 Data Memory RAM, EEPROM and special function registers (SFRs) are assigned to the Data Memory Address Space. These Memory are located in a different address space from program memory. The data length of the Data Memory is 4 bits (1 nibble). The Data Memory uses two banks (256 nibbles/bank): one for the SFR and EEPROM areas using part of the bank 0 and the other for the RAM area, containing the stack in the bank 7. BANK7 BANK0 4 bits 4 bits RAM area Data/Stack area 128N 128N Inaccessible area EEPROM area SFR area HALT MIEF Other SFR area 124N 07FH 07EH 07DH 07CH 000H 000H 07FH 0FFH 1FFH 2FFH 3FFH 4FFH 5FFH 6FFH 7FFH Stack pointer EEPROM area 128N 128N 128N (MSM64424) (MSM64424) BANK0 0FFH 080H Data/Stack area 64N 64N (MSM64422) EEPROM area 64N 64N (MSM64422) Note : "N" means data length of 4 bits. Data Memory Address Space The Data Memory Address Space configuration is shown in the figure alove. The stack area is a data save area for subroutines and interrupts from the address 7FFH toward the lower-order addresses (64N max. for MSM64422, 128N max. for MSM64424) by subroutine call instruction. For the bank 0, the special function register area from the addresses from 000H to 07FH and 64 nibble EEPROM area from the addresses 080H to 0BFH for MSM64422 or 128 nibble EEPROM area from the addresses 080H to 0FFH for MSM64424 are assigned. |
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Similar Description - MSM64424-XXXGS-K |
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