11
MC97F60128
ABOV Semiconductor Co., Ltd.
1.4.3
Circuit Design Guide
At the FLASH programming, the programming tool needs 5 signal lines that are DSCL, DSDA, RUNFLAG, VDD and
VSS. When you design the PCB circuits, you should consider the usage of these signal lines for the on-board
programming.
Please be careful to design the related circuit of these signal pins because rising/falling timing of DSCL and DSDA is
very important for proper programming.
To application circuit
DSCL(I)
DSDA(I/O)
To application circuit
R2 (2k
Ω
~ 5k
Ω
)
RUNFLAG
E-PGM+, E-GANG4/E-GANG6
VDD
VSS
R1 (2k
Ω
~ 5k
Ω
)
VDD
R3
(10k
Ω
)
R4
(10k
Ω
)
Option
NOTE)
1. In on-board programming mode, very high-speed signal will be provided to pin DSCL and
DSDA. And it will cause some damages to the application circuits connected to DSCL or
DSDA port if the application circuit is designed as high speed response such as relay
control circuit. If possible, the I/O configuration of DSDA, DSCL pins had better be set to
input mode.
2. The value of R1 and R2 is recommended value. It varies with circuit of system.
3. The RUNFLAG has an internal pull-down resistor(Typ 50k
Ω @ 5V
).
4. The DSCL and DSDA have an internal pull-up resistor(Typ 50k
Ω @ 5V
) during power on
or OCD mode.
5. The option is recommended if the DSCL and DSDL is not used to application circuit. This
can increase the stability of the system.
Figure 1.5
PCB design guide for on board programming
Содержание MC97F60128
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