Legacy-Free Keyboard/Embedded Controller with SPI and LPC Docking Interface
HIGH
ADDRESS
(MBX9Fh)
(0x7FB0)
A[15:8]
A[7:0]
LOW
ADDRESS
(MBX80h)
(0x7FB1)
64K
EMBEDDED
FLASH
DOUT[7:0]
TRISTATE
DRIVER
DIN[7:0]
nRD
DATA
(MBX81h)
(0x7FB2)
nWE
Figure 9.2 8051/LPC Flash Program Access
Note: This figure is for illustration purposes only and is not intended to suggest specific implementation
details.
9.5
LPC Bus Flash Program Access
The LPC Flash Program Access function enables the 64k Embedded Flash to be programmed from an
internal parallel hardware interface (see Figure 9.2 above). The LPC Flash Program Access function
uses the registers in the Mailbox Registers Interface (see Section 9.10.7, "8051/LPC Flash Program
Access Registers"). The LPC PGM bit D1 in the Flash Program register is used to enable the LPC
Program Access function (see Section 9.10.5, "LPC PGM – D1" below). The LPC Flash Program Access
function can only be enabled when the ATE PGM and the 8051 PGM bits are deasserted ‘0’ (Table 9.1),
and the SYSTEM FLASH bit in the Disable register is deasserted ‘0’(See Section 7.8.3.1, "Disable
Register").
APPLICATION NOTE: The 8051 must be stopped to use the LPC Bus Flash Program Access function. When Flash
programming operations are completed, the LPC Host must return the Embedded Flash to
the READ ARRAY state (Table 8.6) before returning to the 8051 Code Fetch Access mode
(Table 9.1) and restarting the 8051 clock.
To program the 64k Embedded Flash using the LPC Bus Flash Program Access function, first use the
Flash High Address (MBX9Fh) and Flash Low Address (MBX80h) registers for program and page
address arguments and then the Flash Data register (MBX81h) for program data, read data, command
codes and status data.
Note: Address arguments for Program Byte and Page Erase operations must be initialized in the LPC
Flash Program Access address registers before read and write commands to the CSI Host
Interface are activated by reads and writes to the LPC Flash Program Access DATA register
(MBX81h).
Revision 1.1 (01-14-03)
110
SMSC LPC47N350
DATASHEET
SMSC [ SMSC CORPORATION ]
