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6.7
On-Board Programming Modes
There are two modes for programming/erasing of the flash memory; boot mode, which enables on-
board programming/erasing, and programmer mode, in which programming/erasing is performed
with a PROM programmer. On-board programming/erasing can also be performed in user
program mode. At reset-start in reset mode, the series of HD64F38024, HD64F38024R, and
HD64F38124 changes to a mode depending on the TEST pin settings, P95 pin settings, and input
level of each port, as shown in table 6.7. The input level of each pin must be defined four states
before the reset ends.
When changing to boot mode, the boot program built into this LSI is initiated. The boot program
transfers the programming control program from the externally-connected host to on-chip RAM
via SCI3. After erasing the entire flash memory, the programming control program is executed.
This can be used for programming initial values in the on-board state or for a forcible return when
programming/erasing can no longer be done in user program mode. In user program mode,
individual blocks can be erased and programmed by branching to the user program/erase control
program prepared by the user.
Table 6.7
Setting Programming Modes
TEST
P95
P34
0
1
X
0
0
1
1
X
X
X: Don't care
PB0
PB1
PB2
X
X
X
X
X
X
0
0
0
LSI State after Reset End
User Mode
Boot Mode
Programmer Mode
Rev. 6.00, 08/04, page 161 of 628
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