Flash Memory Register Descriptions - Hitachi H8/3048 Hardware Manual

18.5 Flash Memory Register Descriptions

www.DataSheet4U.com
18.5.1 Flash Memory Control Register
The flash memory control register (FLMCR) is an eight-bit register that controls the flash memory
operating modes. Transitions to program mode, erase mode, program-verify mode, and erase-
verify mode are made by setting bits in this register. FLMCR is initialized to H'00 by a reset, in
the standby modes, and when 12 V is not applied to V
entry to a standby mode initializes FLMCR to H'80.
Bit 7
V
PP
*
Initial value 0
R/W R
Programming power
Status flag indicating the
power to V
Note: * The initial value is H'00 in modes 5, 6, and 7 (on-chip flash memory enabled). In modes
1, 2, 3, and 4 (on-chip flash memory disabled), this register cannot be modified and is
always read as H'FF.
6 5 4
V E — —
PP
0 0 0
R/W — —
Reserved bits
V enable
PP
Disables or enables 12-V
application to V pin
PP
PP
574
. When 12 V is applied to V
PP
3 2 1
EV PV E
0 0 0
* * *
R/W R/W R/W
Erase mode
Designates transition
to or exit from erase
mode
Program-verify mode
Designates transition to
or exit from program-verify
mode
Erase-verify mode
Designates transition to
or exit from erase-verify
mode
, a reset or
PP
0
P
0
*
R/W
Program mode
Designates
transition to
or exit from
program mode