MC68HC908MR8 Datasheet, PDF (64/372 Pages) Motorola, Inc – Microcontrollers

FLASH Memory
16-BIT MEMORY ADDRESS
START ADDRESS OF
FLASH 1 1
BLOCK PROTECT
FLBPR VALUE
000000
Figure 4-4. FLASH Block Protect Address
$80 = The entire FLASH memory is protected.
$81 = Protected range: $E040–$FFFF
$82 = Protected range: $E080–$FFFF
↓
↓
↓
$FE = Protected range: $FF80–$FFFF
$FF = Entire FLASH memory is not protected.
If all bits are erased, then all of the memory is available for erase and
program. The presence of a voltage V_HI on the IRQ pin will bypass the
block protection so that all of the memory, including the block protect
register, is open for program and erase operations.
4.3.3 Low-Power Modes
The WAIT and STOP instructions will place the MCU in a low power-
consumption standby mode.
4.3.3.1 Wait Mode
Putting the MCU into wait mode while the FLASH is in read mode does
not affect the operation of the FLASH memory directly, but there will not
be any memory activity since the CPU is inactive.
The WAIT instruction should never be executed while performing a
program or erase operation on the FLASH. When the MCU is put into
wait mode, the charge pump for the FLASH is disabled so that either a
program or erase operation will not continue. If the memory is in either
program mode (PGM = 1, HVEN = 1) or erase mode (ERASE = 1,
HVEN = 1), then it will remain in that mode during wait.
NOTE:
Exiting from wait must now be done with a reset rather than an interrupt
because if exiting wait with an interrupt, the memory will not be in read
mode and the interrupt vector cannot be read from the memory.
Technical Data
64
FLASH Memory
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor