H8SXSLASH1663 datasheet(955/1158 Pages) RENESAS

955 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 903 of 1102

REJ09B0294-0100

21.7

On-Board Programming Mode

When the mode pins (MD0, MD1, MD2, and MD3) are set to on-board programming mode and

the reset start is executed, a transition is made to on-board programming mode in which the on-

chip flash memory can be programmed/erased. On-board programming mode has three operating

modes: SCI boot mode by PM2 setting, USB boot mode, and user program mode.

Table 21.5 shows the pin setting for each operating mode. For details on the state transition of

each operating mode for flash memory, see Figure 21.2.

Table 21.5

On-Board Programming Mode Setting

Mode Setting

EMLE

MD3

MD2

MD1

MD0

PM2

SCI boot mode

USB boot mode

User program mode



21.7.1

SCI Boot Mode

SCI boot mode executes programming/erasing of the user MAT by means of the control command

and program data transmitted from the externally connected host via the on-chip SCI_4.

In SCI boot mode, the tool for transmitting the control command and program data, and the

program data must be prepared in the host. The serial communication mode is set to asynchronous

mode. The system configuration in SCI boot mode is shown in figure 21.6. Interrupts are ignored

in SCI boot mode. Configure the user system so that interrupts do not occur.

RxD4

TxD4

Software for

analyzing

control

commands

(on-chip)

Flash

memory

On-chip

RAM

SCI_4

This LSI

PM2

MD3 to MD0

0010

Host

Programming

tool and program

data

Control command,

program data

Response

Figure 21.6 System Configuration in SCI Boot Mode

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