m35b32 STMicroelectronics, m35b32 Datasheet - Page 22

• Manufacturer Part Number: m35b32
• Description: 32 Kbit, 256-byte Page, Fast Program Eeprom Memory Accessed By Spi Bus Interface
• Manufacturer: STMicroelectronics

Instructions
6.6
22/42
Read Data Bytes (READ)
The device is first selected by driving Chip Select (S) low. The instruction code for the Read
Data Bytes (READ) instruction is followed by a 2-byte address (A15-A0), each bit being
latched-in during the rising edge of Serial Clock (C). Then the memory contents, at that
address, is shifted out on Serial Data Output (Q), each bit being shifted out, at a maximum
frequency f
The instruction sequence is shown in
The first byte addressed can be at any location. The address is automatically incremented
to the next higher address after each byte of data is shifted out. The whole memory can,
therefore, be read with a single Read Data Bytes (READ) instruction. When the highest
address (0FFFh) is reached, the address counter rolls over to 0000h, allowing the read
sequence to be continued indefinitely.
The Read Data Bytes (READ) instruction is terminated by driving Chip Select (S) high. Chip
Select (S) can be driven high at any time during data output. Any Read Data Bytes (READ)
instruction, while an Erase, Program or Write cycle is in progress, is rejected without having
any effects on the cycle that is in progress.
Figure 12. Read Data Bytes (READ) instruction sequence and data-out sequence
1. Address bits A15 to A12 are Don’t Care.
S
C
D
Q
0
R
, during the falling edge of Serial Clock (C).
1
High Impedance
2
Instruction
3
4
5
6
Doc ID 18391 Rev 3
7
MSB
15
8
14 13
9 10
Figure 12
16-Bit Address
3
20 21 22 23 24 25 26 27
2
1
0
MSB
7
6
5
Data Out 1
4
3
28 29 30
2
1
0
31
7
Data Out 2
AI01793D
M35B32