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CHAPTER 8 NOTES ON TARGET SYSTEMS
The following show examples of the interface circuits of UART (asynchronous communication port) and SIO (3-wire
clocked communication port).
Refer to the above design proposal for the pin processing of the device to be used.
? Using two-power-supply flash memory microcontroller
Figure 8-1. UART Interface Circuit Example
V CC
V CC
IC
C
SI 5
7
CLK 9
2
4
6
8
10
Connector
1
RESET GND 3
V DD
V PP SO
H/S SCK
VDE
1 k ?
TxD
RxD
X1
X2
Y
C
FAP-1008#2
V CC
V PP
RESET
R
V CC
1 k ?
V DD
V SS
R
JUMPER
User reset circuit
Microcontroller
Caution1.
2.
3.
4.
Insert neither capacitors nor resistors into the V PP line unless otherwise stated. When pull-
down resistors are inserted into the V PP line, the resistor value must be 470 ? or higher.
The PG-FP4 generally performs normally without pin processing.
If the pins of the PG-FP4's output signals (SO/TxD) are processed, pull up (or pull down) with a
resistor value in compliance with the specifications (V IH , V IL ) of the target device, referring to
CHAPTER 9 TARGET SYSTEM INTERFACE CIRCUITS.
If the pins of the PG-FP4's input signals (SI/RxD, RESET) are processed, pull up (or pull down)
with a resistor value in compliance with the specifications (I OH , I OL ) of the target device,
referring to CHAPTER 9 TARGET SYSTEM INTERFACE CIRCUITS.
User ’s Manual U15260EJ4V0UM
97
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