UPD78F9234MC-5A4-A Datasheet, PDF (332/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 20 ON-CHIP DEBUG FUNCTION
20.1 Connecting QB-MINI2 to 78K0S/KB1+
The 78K0S/KB1+ uses RESET, X1, X2, INTP3, VDD, and GND pins to communicate with the host machine via an
on-chip debug emulator (QB-MINI2).
<R> Caution The 78K0S/KB1+ has an on-chip debug function, which is provided for development and
evaluation. Do not use the on-chip debug function in products designated for mass production,
because the guaranteed number of rewritable times of the flash memory may be exceeded when
this function is used, and product reliability therefore cannot be guaranteed. NEC Electronics is
not liable for problems occurring when the on-chip debug function is used.
Target connector
GND ¹
RESET_OUT ²
DATA ³
VDD ⁴
DATA ⁵
R.F.U. ⁶
R.F.U. ⁷
H/S^{Note 4 8}
9
CLK
10
R.F.U.
11
R.F.U.
12
INTP
13
R.F.U.
14
CLK
15
RESET_IN
16
R.F.U.
Figure 20-1. Recommended Circuit Connection
VDD
VDD
3 to 10 kΩ
Target device
RESET^{Note 1}
X2^{Note 2}
Note 3
VDD
VDD
Note 3
1 kΩ
X1^{Note 2}
VDD
GND
10 kΩ
VDD
1 kΩ
INTP3^{Note 5}
1 to 10 kΩ
Reset circuit
RESET signal
Caution The constants described in the circuit connection example are reference values. If you
perform flash programming aiming at mass production, thoroughly evaluate whether the
specifications of the target device are satisfied.
Notes 1. The RESET pin is used to download the monitor program at debugger startup or to implement
forced reset. Therefore, a pin that alternately functions as the RESET pin cannot be used. For
reset pin connection, refer to QB-MINI2 User’s Manual (U18371E).
2. This is the pin connection when the X1 and X2 pins are not used in the target system. When using
the X1 and X2 pins, refer to 20.1.2 Connection of X1 and X2 pins.
3. No problem will occur if the dashed line portions are connected.
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User’s Manual U17446EJ5V0UD