STA450A datasheet(14/66 Pages) STMICROELECTRONICS

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STA450A

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2.2.3

"Single read" & "multiple read" & "sub-address + single read" & "sub-address + multiple

read"

The single read operations are performed from the current sub-address value. The sub-address value can be

initialized using the "sub_address" initialization" sequence presented in the previous transfer chart : see the

"combined format - sub-address + single read" diagram in the following chart.

The multiple read operations are performed from the current sub-address value and the sub-address register is

automatically incremented at each access. The sub-address value can be initialized using the "sub_address ini-

tialization" sequence presented in the previous transfer chart : see the "combined format - sub-address + mul-

tiple read" diagram in the following chart. The length of a multiple read is limited to the size of the Host register

area (256 locations). A multiple read is terminated by a Non Master Acknowledge followed by a STOP condition.

START

SLAVE A DDR ESS

SUB-AD DR E SS @

DAT A TO @ SA ST OP

SUB-A D DR ESS + SING L E W RIT E

SUB-ADDRESS IN ITIA L IZ A TION

W : R/W B IT = WR IT E

SA : SLAVE AC KNOWL ED GE

@ : SUB-AD DR E SS V AL UE

START

SLAVE A DDR ESS

SUB-AD DR E SS @

DAT A TO @ SA

SU B-AD D RES S + MU LT IP LE W RITE

DAT A T O @+1

DA TA TO @+2 SA

STO P

START

SLAVE A DDR ESS

SUB-AD DR E SS @

STO P

STA RT

SLAVE AD-

DA TA

NM A ST OP

SINGLE READ

STA RT

SL AV E ADDRESS

FIRST DAT A

ST OP

MU LTIP LE REA D

SE CON D DA TA

NM A

ST ART

SL AV E ADDRESS

SUB-ADDRESS

WSA

C OM BIN ED FOR MA T : S UB-A D DR ES S + SIN GLE REA D

DAT A FROM @

ST AR

SL AV E A D-

R SA

NM A ST OP

ST ART

SL AV E AD DRE SS

SUB-ADDRESS @

SA ST ART

SLAVE ADDRE SS

DAT A FROM @ + 1

DAT A FROM @

NM A

STO P

C OMBIN ED FO RM AT : S U B-AD D RES S + MU LTIPLE REA D

R : R/W BIT = RE AD

SA : SLAVE ACKNOWL ED GE

MA : M AST ER A CKN OW LE DG E

N M A : N O M A STER ACK NO WLED GE (L AST DA TA )

@ : SU B-AD DRE SS VA LU E

STA450A Datasheet(PDF) 14 Page - STMicroelectronics

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