UPD78F9177 Datasheet, PDF (16/56 Pages) NEC – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78F9177, 78F9177Y
5. FLASH MEMORY PROGRAMMING
The on-chip program memory in the µPD78F9177 and µPD78F9177Y is flash memory.
The flash memory can be written with the µPD78F9177 and µPD78F9177Y mounted on the target system (on-
board). Connect the dedicated flash programmer (Flashpro III (part number: FL-PR3, PG-FP3)) to the host machine
and target system to write the flash memory.
Remark FL-PR3 is made by Naito Densei Machida Mfg. Co., Ltd.
5.1 Selecting Communication Mode
The flash memory is written by using Flashpro III and by means of serial communication. Select a communication
mode from those listed in Table 5-1. To select a communication mode, the format shown in Figure 5-1 is used. Each
communication mode is selected by the number of VPP pulses shown in Table 5-1.
Table 5-1. Communication Mode
Communication Mode
Pins Used
Number of VPP Pulses
3-wire serial I/O
SCK20/ASCK20/P20
0
SO20/TxD20/P21
SMB ^Note1
SI20/RxD20/P22
SCL0/P23
4
SDA0/P24
UART
TxD20/SO20/P21
8
RxD20/SI20/P22
Pseudo 3-wire mode ^Note2
P00 (Serial clock input)
12
P01 (Serial data output)
P02 (Serial data input)
Notes 1. µPD78F9177Y only
2. Serial transfer is performed by controlling a port by software.
Caution Be sure to select a communication mode based on the VPP pulse number shown in Table 5-1.
10 V
VPP VDD
VSS
Figure 5-1. Communication Mode Selection Format
1
2
n
VDD
RESET
VSS
16
Data Sheet U14022EJ1V0DS00