MB85RS256B Datasheet, PDF (8/32 Pages) Fujitsu Component Limited. – 256 K (32 K×8) ビットSPI

MB85RS256B
ɾREAD
READ ίϚϯυ͸ FRAM ϝϞϦηϧΞϨΠͷσʔλΛಡΈग़͠·͢ɻSI ʹ READ ͷΦϖίʔυͱ೚ҙͷ 16 ϏοτͷΞ
υϨεΛೖྗ͠·͢ɻΞυϨεͷ࠷্Ґ 1 Ϗοτ͸ແޮͰ͢ɻͦͷ ޙ, SCK ʹ 8 αΠΫϧͷΫϩοΫΛೖྗ͠·͢ɻSO ͸
SCK ͷཱԼΓΤοδʹಉͯ͠ظग़ྗ͞Ε·͢ɻ͜ͷಡग़͠த , SI ͷ஋͸ແޮͰ͢ɻCS Λ্ཱͪ͛Δͱ READ ίϚϯυ͸ऴ
ྃ͠·͕͢ , CS ্ཱ͛લʹҾ͖ଓ͖ SCK ʹ 8 αΠΫϧͣͭΫϩοΫΛૹΓଓ͚Δ͜ͱͰ , ΞυϨεΛࣗಈΠϯΫϦϝϯ
τͯ͠ಡग़͠Λଓ͚Δ͜ͱ͕ՄೳͰ͢ɻ࠷্ҐΞυϨεʹୡ͢ΔͱϩʔϧΦʔόͯ͠ 0 ൪஍ʹ໭Γ , ಡग़͠αΠΫϧ͸ࡍ
͘ͳݶଓ͚ΒΕ·͢ɻREAD ίϚϯυ͸ , 25 MHz ·Ͱͷಈ࡞ʹରԠ͍ͯ͠·͢ɻ
CS
SCK
SI
SO
0 1 2 3 4 5 6 7 8 9 10 11 12 13
18 19 20 21 22 23 24 25 26 27 28 29 30 31
Φϖίʔυ
16 ϏοτΞυϨε
0 0 0 0 0 0 1 1 X 14 13 12 11 10
543210
Invalid
MSB
High-Z
LSB _MSB
Data Out LSB
76543210
Invalid
ɾWRITE
WRITE ίϚϯυ͸ FRAM ϝϞϦηϧΞϨΠʹσʔλΛॻ͖ࠐΈ·͢ɻSI ʹ WRITE ͷΦϖίʔυͱ೚ҙͷ 16 Ϗοτͷ
ΞυϨε͓Αͼ 8 ϏοτͷॻࠐΈσʔλΛೖྗ͠·͢ɻΞυϨεͷ࠷্Ґ 1 Ϗοτ͸ແޮͰ͢ɻ8 ϏοτͷॻࠐΈσʔλΛ
ೖྗͨ࣌͠఺Ͱ FRAM ϝϞϦηϧΞϨΠʹσʔλΛॻ͖ࠐΈ·͢ɻCS Λ্ཱͪ͛Δͱ WRITE ίϚϯυ͸ऴྃ͠·͕͢ ,
CS ্ཱ͛લʹҾ͖ଓ͖ॻࠐΈσʔλΛ8 ϏοτͣͭૹΓଓ͚Δ͜ͱͰ, ΞυϨεΛࣗಈΠϯΫϦϝϯτͯ͠ॻࠐΈΛଓ͚
Δ͜ͱ͕ՄೳͰ͢ɻ࠷্ҐΞυϨεʹୡ͢ΔͱϩʔϧΦʔόͯ͠ 0 ൪஍ʹ໭Γ , ॻࠐΈαΠΫϧ͸ࡍ͘ͳݶଓ͚ΒΕ·͢ɻ
WRITE ίϚϯυ͸ , 33 MHz ·Ͱͷಈ࡞ʹରԠ͍ͯ͠·͢ɻ
CS
SCK
SI
SO
0 1 2 3 4 5 6 7 8 9 10 11 12 13
18 19 20 21 22 23 24 25 26 27 28 29 30 31
Φϖίʔυ
16 ϏοτΞυϨε
Data In
0 0 0 0 0 0 1 0 X 14 13 12 11 10
543210 76543210
MSB
LSB MSB
LSB
High-Z
8
DS501-00021-3v0-J