Rainbow Electronics MAX6902 - Manual (Page 12)

MAX6902
SPI-Compatible RTC in a TDFN
12 ______________________________________________________________________________________
1 1 1 1 1 1 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2
ADDRESS/COMMAND BYTE** DATA BYTE 1 DATA BYTE N
HIGH IMPEDANCE; NO ACTIVITY ON DOUT LINE DURING WRITES.
D1 D0 0 R*
CS
SCLK
DIN
DOUT
* R = RAM/REGISTER SELECT BIT; RAM = 1, REGISTER = 0.
** ONLY ONE ADDRESS/COMMAND BYTE IS REQUIRED PER BURST TRANSACTION.
Figure 3b. Burst Write
SCLK
1 R* A5 A4 A3 A2 A1 1
DIN
DOUT
ADDRESS/COMMAND BYTE
HIGH IMPEDANCE
DATA BYTE
D7 D6 D5 D4 D3 D2 D1 D0
CS
* R = RAM/REGISTER SELECT BIT; RAM = 1, REGISTER = 0.
Figure 4a. Single Read
1 1 1 1 1 1
ADDRESS/COMMAND BYTE**
D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2
DATA BYTE 1 DATA BYTE N
HIGH IMPEDANCE
1 R*
D1 D0
CS
SCLK
DIN
DOUT
* R = RAM/REGISTER SELECT BIT; RAM = 1, REGISTER = 0.
** ONLY ONE ADDRESS/COMMAND BYTE IS REQUIRED PER BURST TRANSACTION.
Figure 4b. Burst Read