Appendix A Notes On Designing A Target; A-1. Interface Circuit Example For A Uart - NEC Flash Memory Programmer PG-FP3 User Manual

Design a board using a flash microcontroller if you want to study the possibility of on-board writing.
Pin processing
The target may have pins that require special processing when the mode is changed from normal operating
mode to flash memory programming mode, or pins that go to high-impedance during programming. In a mode
in which the operation of the microcontroller is stopped by pin processing, the programming operation cannot be
performed. Therefore, be sure to read the manual for the device before creating the target.
Interface circuit for the PG-FP3
Interface circuit examples for a UART (asynchronous communication port) and SIO (3-wire clocked port) are
given below. Because the PG-FP3 senses the voltage on the target even when V
be sure to connect the V
for the device used.
V
CC
CON
6
RESET GND
7
V
DD
8
V
PP
9
HS
10
NC
FAP-1008#2
R
V
CC
10K
R
10K

APPENDIX A NOTES ON DESIGNING A TARGET

pin. For information on pin processing of the device, be sure to refer to the manual
DD
Figure A-1. Interface Circuit Example for a UART
V V
CC
R
10K
1
2
SI
3
SO
4
SCK
5
CLK
V
CC
User reset circuit
JUMPER
User's Manual U13502EJ2V0UM00
CC
IC
R X1
10K
TxD
RxD
X2
V
PP
RESET
V
DD
V
SS
Microcontroller
is not supplied to the target,
DD
C
Y
C
91