UPD78F0138 NEC, UPD78F0138 Datasheet - Page 449

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

27.6
the target system. First provide a function that selects the normal operation mode or flash memory programming
mode on the board.
the same status as immediately after reset. Therefore, if the external device does not recognize the state immediately
after reset, the pins must be handled as described below.
27.6.1 V
supplied to the V
(1) Connect pull-down resistor R
(2) Switch the input of the V
27.6.2 Serial interface pins
the board, care must be exercised so that signals do not collide or that the other device does not malfunction.
To write the flash memory on-board, connectors that connect the dedicated flash programmer must be provided on
When the flash memory programming mode is set, all the pins not used for programming the flash memory are in
In the normal operation mode, the V
The pins used by each serial interface are listed below.
To connect the dedicated flash programmer to the pins of a serial interface that is connected to another device on
Handling of Pins on Board
PP
pin
PP
pin in the flash memory programming mode. Perform the following pin handling.
CSI10
CSI10 + HS
UART0
UART0 + HS
UART6
PD78F0134, 78F0138
PP
pin to the programmer side by using a jumper on the board or to GND directly.
Figure 27-14. Example of Connection of V
VPP
Table 27-6. Pins Used by Each Serial Interface
Serial Interface
= 10 kΩ to the V
V
PP
PP
CHAPTER 27
pin is connected to V
User’s Manual U16228EJ2V0UD
Dedicated flash programmer connection pin
PP
µ
pin.
PD78F0134, 78F0138
Pull-down resistor (R
SO10, SI10, SCK10
SO10, SI10, SCK10, HS/P15
TxD0, RxD0
TxD0, RxD0, HS/P15
TxD6, RxD6
SS
. In addition, a write voltage of 10.0 V (TYP.) is
Pins Used
VPP
PP
)
Pin
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