w83l950d Winbond Electronics Corp America, w83l950d Datasheet - Page 76

• Manufacturer Part Number: w83l950d
• Description: Peripheral Personal Computer Keyboard Controller
• Manufacturer: Winbond Electronics Corp America

19. FLASH MEMORY
19.1 On chip program flash memory
19.1.1 SFRAH, SFRAL(0F9h, 0F8h)
19.2 External Programming Mode
18.1.1 SFRFD (0FAh)
18.1.2 SFRCN (0FBh)
The programming address of on-chip flash memory is separated into two registers. The SFRAH
contains the high order byte of address; the SFRAL contains the low-order byte of address.
This is a programming data byte for on-chip flash memory.
This is a flash control byte for on-chip flash memory.
The context of flash in Winbond Keyboard controller is empty by default. At the first use, you
must program the flash by external writer device. For programming the flash by external
device, the Winbond Keyboard controller must enter the flash-programming mode by CNvss is
connected to VCC. RESET# is connected to VCC, GP35 is connected to VSS. FA<7:0> and
FD<7:0> port is combined to GP07 to GP00. FA<7:0> is latched by the GP34.
Erase all bank
Program APROM
Read APROM
BIT
5-4
3-0
7
6
MODE
CTRL[3:0]
Reserved
NAME
NOE
NCE
NOE
1
1
0
MTP-ROM output enable
MTP-ROM chip enable
The flash control signals
NCE
0
0
0
- 67 -
CTRL<3:0>
0001
0000
0110
Publication Release Date: June 23, 2003
FUNCTION
Address in
Address in
SFRAH,
SFRAL
X
W83L950D
Revision 1.0
Data out
SFRFD
Data in
X