71M6543F/H and 71M6543G/GH Data Sheet
Name
Location Rst Wk Dir Description
Flash Bank Selection (71M6543G and 71M6543GH only)
The program memory of the 71M6543G/GH consists of a fixed lower bank of 32 KB,
addressable at 0x0000 to 0x7FFF plus an upper banked area of 32 KB, addressable at
0x8000 to 0xFFFF. The I/O RAM register FL_BANK is used to switch one of four
memory banks of 32 KB each into the address range from 0x8000 to 0xFFFF. Note that
when FL_BANK = 0, the upper bank is the same as the lower bank.
FL_BANK[1:0]
SFR B6[1:0] 01 01 R/W
Address Range for Lower Bank
(0x0000-0x7FFF)
0x0000-0x7FFF
Address Range for Upper Bank
(0x8000-0xFFFF)
FL_BANK[1:0]
00
01
10
11
0x0000-0x7FFF
0x0000-0x7FFF
0x8000-0xFFFF
0x0000-0x7FFF
0x0000-0x7FFF
0x10000-0x17FFF
0x18000-0x1FFFF
Flash Erase Initiate
FLSH_ERASE is used to initiate either the Flash Mass Erase cycle or the Flash Page
Erase cycle. Specific patterns are expected for FLSH_ERASE in order to initiate the
appropriate Erase cycle. (default = 0x00).
0x55 – Initiate Flash Page Erase cycle. Must be proceeded by a write to
FLSH_PGADR[5:0] (SFR 0xB7).
FLSH_ERASE[7:0]
SFR 94[7:0] 0
0
W
0xAA – Initiate Flash Mass Erase cycle. Must be proceeded by a write to
FLSH_MEEN (SFR 0xB2) and the debug (CC) port must be enabled.
Any other pattern written to FLSH_ERASE has no effect.
Mass Erase Enable
0 = Mass Erase disabled (default).
1 = Mass Erase enabled.
Must be re-written for each new Mass Erase cycle.
FLSH_MEEN
SFR B2[1]
SFR B2[3]
0
0
0
0
0
W
R
Indicates that a posted flash write is pending. If another flash write is attempted, it is
ignored.
FLSH_PEND
Flash Page Erase Address
Flash Page Address (page 0 thru 63) that is erased during the Page Erase cycle.
(default = 0x00).
FLSH_PGADR[5:0]
SFR B7[7:2] 0
W
Must be re-written for each new Page Erase cycle.
Enables posted flash writes. When 1, and if CE_E = 1, flash write requests are stored in
a one element deep FIFO and are executed when CE_BUSY falls. FLSH_PEND can be
read to determine the status of the FIFO. If FLSH_PSTWR = 0 or if CE_E = 0, flash writes
are immediate.
FLSH_PSTWR
SFR B2[2]
0
0
R/W
108
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