h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 580

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 19 ROM
19.6
When pins are set to on-board programming mode, program/erase/verify operations can be
performed on the on-chip flash memory. There are two on-board programming modes: boot mode
and user program mode. The pin settings for transition to each of these modes are shown in table
19.3. For a diagram of the transitions to the various flash memory modes, see figure 19.2.
Table 19.3 Setting On-Board Programming Modes
19.6.1
Table 19.4 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
2. SCI_1 should be set to asynchronous mode, and the transfer format as follows: 8-bit data, 1
3. When the boot program is initiated, the chip measures the low-level period of asynchronous
Rev. 2.00 Dec. 05, 2005 Page 542 of 724
REJ09B0200-0200
Mode Setting
Boot mode
User program mode
the host beforehand. Prepare a programming control program in accordance with the
description in section 19.8, Flash Memory Programming/Erasing.
In boot mode, if any data has been programmed into the flash memory (if all data is not 1), all
flash memory blocks are erased. Boot mode is for use when user program mode is unavailable,
such as the first time on-board programming is performed, or if the program activated in user
program mode is accidentally erased.
stop bit, and no parity.
SCI communication data (H'00) transmitted continuously from the host. The chip then
calculates the bit rate of transmission from the host, and adjusts the SCI_1 bit rate to match
that of the host. The reset should end with the RxD pin high. The RxD and TxD pins should be
pulled up on the board if necessary. After the reset is complete, it takes approximately 100
states before the chip is ready to measure the low-level period.
On-Board Programming Modes
Boot Mode
Expanded mode
Single-chip mode
Expanded mode
Single-chip mode
FWE
1
1
MD2
0
0
1
1
MD1
1
1
1
1
MD0
0
1
0
1