CHAPTER 16 FLASH MEMORY (
µµµµ
PD70F3116)
733
User’s Manual U14492EJ3V0UD
16.5 Pin Connection
When performing on-board writing, install a connector on the target system to connect to the dedicated flash
programmer. Also, install a function on-board to switch from the normal operation mode (single-chip modes 0, 1 or
ROMless modes 0, 1) to the flash memory programming mode.
In the flash memory programming mode, all the pins not used for flash memory programming become the same
status as they were immediately after reset in single-chip mode 0. Therefore, all the ports become output high-
impedance status, so that pin connection is required when the external device does not acknowledge the output high-
impedance status.
16.5.1 V
PP
pin
In the normal operation mode, 0 V is input to the V
PP
pin. In the flash memory programming mode, 7.8 V writing
voltage is supplied to the V
PP
pin. The following shows an example of the connection of the V
PP
pin.
Figure 16-5. Connection Example of V
PP
Pin
V850E/IA1
V
PP
Pull-down resistor (R
VPP
= 4.7 to 47 k
Ω
)
Dedicated flash programmer connection pin
16.5.2 Serial interface pin
The following shows the pins used by each serial interface.
Table 16-2. Pins Used by Each Serial Interface
Serial Interface
Pins Used
CSI0
SO0, SI0, SCK0
CSI0 + HS
SO0, SI0, SCK0, PDH0
UART0
TXD0, RXD0
When connecting a dedicated flash programmer to a serial interface pin that is connected to other devices on-
board, care should be taken to avoid the conflict of signals and the malfunction of other devices, etc.
(1) Conflict of signals
When connecting a dedicated flash programmer (output) to a serial interface pin (input) which is connected to
another device (output), a conflict of signals occurs. To avoid the conflict of signals, isolate the connection to
the other device or set the other device to the output high-impedance status.
Содержание V850E/IA1 mPD703116
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