32186 datasheet(195/1032 Pages) RENESAS

195 / 1032 page

INTERNAL MEMORY

6-53

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

6.9 Connecting to Serial Programmer (UART Mode)

The diagram below shows an example of a user system configuration which has had a serial programmer con-

nected. After the user system is powered on, the serial programmer writes to the internal flash memory in clock-

asynchronous serial mode (UART mode). No communication problems associated with the oscillator frequency

may occur. If the system uses any pins that are to be connected to a serial programmer, care must be taken to

prevent adverse effects on the system when a serial programmer is connected. Note that the serial programmer

uses the addresses H’0000 0084 through H’0000 008F as an area in which to check the ID for flash memory

protection. If the internal flash memory needs to be protected, set any ID in this area.

32185/32186

XOUT

XIN

JTRST

MOD1

MOD2

AVSS0

VSS

RESET#

MOD0

P84/SCLKI0/SCLKO0

P87/SCLKI1/SCLKO1

P86/RXD1

P85/TXD1

EXCVDD

EXCVCC

VCC-BUS

VREF0

AVCC0

VDDE

VCCER

Connect to the VCCE (5 or 3.3 V)

power supply rail

Main power supply

Connect to the

VCCE (5 or 3.3V)

power supply rail

Main power supply

(for reference)

RxD (input)

TxD (output)

Mode selection

(output)

GND (common)

Connector

Flash programmer signals

To system circuit

Set microcomputer

operating conditions

User system board

Connect to the

user system

power supply rail

VCCE

SBI#

(Note 1)

Note 1: SBI# must be fixed "H" or "L" to ensure that no interrupts will be generated.

Notes: • Turn on the power for the user system before writing to the internal flash memory.

• If P84-P87 are used in the system circuit, connection to a serial programmer must be taken into consideration.

• The pullup/pulldown resistance values of P84, P86, P87, FP and MOD0 must be selected to suit the system design condition.

• The typical pullup/pulldown resistance values of P84, P86, P87, FP and MOD0 are 4.7 to 10 K

Ω.

• The status of any other ports that are not shown here will not affect flash memory programming.

• Make sure the mode setting pin/power supply voltages do not fluctuate to prevent unintended changes of modes

while rewriting the internal flash memory.

Figure 6.9.1 Pin Connection Diagram (UART Mode)

32186 Datasheet(PDF) 195 Page - Renesas Technology Corp

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