W25M02GV
8.2.12 Load Program Data (02h) / Random Load Program Data (84h)
The Program operation allows from one byte to 2,112 bytes (a page) of data to be programmed at
previously erased (FFh) memory locations. A Program operation involves two steps: 1. Load the program
data into the Data Buffer. 2. Issue “Program Execute” command to transfer the data from Data Buffer to
the specified memory page.
A Write Enable instruction must be executed before the device will accept the Load Program Data
Instructions (Status Register bit WEL= 1). The “Load Program Data” or “Random Load Program Data”
instruction is initiated by driving the /CS pin low then shifting the instruction code “02h” or “84h” followed by
a 16-bit column address (only CA[11:0] is effective) and at least one byte of data into the DI pin. The /CS
pin must be held low for the entire length of the instruction while data is being sent to the device. If the
number of data bytes sent to the device exceeds the number of data bytes in the Data Buffer, the extra
data will be ignored by the device. The Load Program Data instruction sequence is shown in Figure 15.
Both “Load Program Data” and “Random Load Program Data” instructions share the same command
sequence. The difference is that “Load Program Data” instruction will reset the unused the data bytes in
the Data Buffer to FFh value, while “Random Load Program Data” instruction will only update the data
bytes that are specified by the command input sequence, the rest of the Data Buffer will remain
unchanged.
If internal ECC algorithm is enabled, all 2,112 bytes of data will be accepted, but the bytes designated for
ECC parity bits in the extra 64 bytes section will be overwritten by the ECC calculation. If the ECC-E bit is
set to a 0 to disable the internal ECC, the extra 64 bytes section can be used for external ECC purpose or
other usage.
/CS
Mode 3
Mode 0
0
7
8
9
21 22 23 24
CLK
Instruction
Column Address[15:0]
15 14 13
DI
(IO0)
2
1
0
7
02h / 84h
High Impedance
DO
(IO1)
/CS
24
30 31 32
38 39 40
Mode 3
Mode 0
CLK
Data-0
Data-1
Data-2111
DI
(IO0)
7
6
1
0
7
6
1
0
7
0
7
6
1
0
High Impedance
DO
(IO1)
Figure 15. Load / Random Load Program Data Instruction
Publication Release Date: July 1, 2015
Preliminary - Revision B
- 36 -
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