NEC PG-FP4, Руководство пользователя

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CHAPTER 8 NOTES ON TARGET SYSTEMS
User’s Manual U15260EJ3V1UM
100
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.
Figure 8-1. UART Interface Circuit Example
V
CC
V
CC
JUMPER
User reset circuit
V
CC
V
CC
R
R
R
CON
FAP-1008#2
Microcontroller
IC
Y
C
C
2
4
6
8
10
RESET
V
DD
V
PP
HS
NC
GND
SI
SO
SCK
CLK
1
3
5
7
9
TxD
X1
X2
RxD
V
PP
V
DD
V
SS
RESET
R
* The PG-FP4 generally performs normally without pin processing.
* If the pins of the PG-FP4's output signals (SO/TxD, SCK, RESET) 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 output signals (SI/RxD, HS) 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 .
Caution 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
Ω
Ω Ω
Ω
or higher.
Figure 8-2. SIO Interface Circuit Example
V
CC
V
CC
JUMPER
User reset circuit
V
CC
V
CC
R
R
R
CON
FAP-1008#2
Microcontroller
IC
Y
C
C
2
4
6
8
10
RESET
V
DD
V
PP
HS
NC
GND
SI
SO
SCK
CLK
1
3
5
7
9
SO
X1
X2
SI
SCK
V
PP
V
DD
V
SS
RESET
R
* The PG-FP4 generally performs normally without pin processing.
* If the pins of the PG-FP4's output signals (SO/TxD, SCK, RESET) 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 .
* In case the pins of PG-FP4's output signals (SI/RxD, HS) are processed, pull up (or pull down) with resistor value in compliance with
the specifications (I
OH
, I
OL
) of the target device referring to CHAPTER 9 TARGET SYSTEM INTERFACE CIRCUITS .
Caution 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
Ω Ω Ω Ω
or higher.