Flash Memory Programming; Selecting Communication Mode - NEC UPD789026 Series User Manual

13.1 Flash Memory Programming

The program memory provided to the µ PD78F9026A is flash memory.
The flash memory can be written on-board, i.e., with the µ PD78F9026A mounted on the target system.
To do so, connect a dedicated flash writer (Flashpro III (Part number: FL-PR3, PG-FP3)) to the host machine
and target system.
Remark FL-PR3 is a product of Naito Densei Machida Mfg. Co., Ltd.

13.1.1 Selecting communication mode

The flash memory is written by using Flashpro III and by means of serial communication.
communication mode from those listed in Table 13-2. To select a communication mode, the format shown in Figure
13-1 is used. Each communication mode is selected depending on the number of V
Communication Mode
3-wire serial I/O
UART
Pseudo 3-wire mode
Note Serial transfer is performed by controlling the port with software.
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Caution Be sure to select a communication mode by the number of V
10 V
V
PP
V
DD
V
SS
V
DD
RESET
V
SS
180
CHAPTER 13 µ µ µ µ PD78F9026A
Table 13-2. Communication Modes
SCK0/ASCK/P20
SO0/TxD/P21
SI0/RxD/P22
TxD/SO0/P21
RxD/SI0/P22
Note
P00 (Serial clock input)
P01 (Serial data output)
P02 (Serial data input)
P40/KR0 (serial clock input)
P41/KR1 (serial data output)
P42/KR2 (serial data input)
Figure 13-1. Communication Mode Selection Format
User's Manual U11919EJ3V0UM00
Pins Used
0
8
12
13
PP
1 2
Select a
pulses shown in Table 13-2.
PP
Number of V Pulses
PP
pulses shown in Table 13-2.
n