On-Board Programming Modes; Boot Mode - Renesas H8 Series Hardware Manual

Section 6 ROM
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,
HD64F38124, and HD64F38122 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
6.7.1

Boot Mode

Table 6.8 shows the boot mode operations between reset end and branching to the programming
control program.
1. When boot mode is used, the flash memory programming control program must be prepared in
the host beforehand. Prepare a programming control program in accordance with the
description in section 6.8, Flash Memory Programming/Erasing.
2. SCI3 should be set to asynchronous mode, and the transfer format as follows: 8-bit data, 1 stop
bit, and no parity. The inversion function of TXD and RXD pins by the SPCR register is set to
"Not to be inverted," so do not put the circuit for inverting a value between the host and this
LSI.
Rev. 7.00 Mar 10, 2005 page 164 of 652
REJ09B0042-0700
PB0 PB1 PB2
X X X
X X X
0 0 0
LSI State after Reset End
User Mode
Boot Mode
Programmer Mode