UPD70F3114 Datasheet, PDF (41/692 Pages) NEC – 32-Bit Single-Chip Microcontrollers

CHAPTER 2 PIN FUNCTIONS
(14) MODE0, MODE1 (Mode) … Input
These are the input pins that specify the operation mode. Operation modes are broadly divided into normal
operation modes and flash memory programming mode. The normal operation modes are single-chip mode
and ROMless mode (see 3.3 Operation Modes for details). The operation mode is determined by sampling
the status of each of the MODE0 and MODE1 pins on a reset.
Fix these pins so that the input level does not change during operation.
(a) µPD703114
MODE1
MODE0
L
L
L
H
Other than above
Normal operation mode
Setting prohibited
Operation Mode
ROMless mode
Single-chip mode
(b) µPD70F3114
MODE1/VPP
MODE0
L
L
L
H
7.8 V
H
Other than above
Remark L: Low-level input
H: High-level input
Operation Mode
Normal operation mode
ROMless mode
Single-chip mode
Flash memory programming mode
Setting prohibited
(15) RESET (Reset) … Input
RESET input is asynchronous input. When a signal having a certain low level width is input in asynchronous
with the operation clock, a system reset that takes precedence over all operations occurs.
Besides a normal initialize or start, this signal is also used to release a standby mode (HALT, IDLE, software
STOP).
(16) X1, X2 (Crystal)
These pins connect a resonator for system clock generation.
They can also input external clocks. In this case, connect the external clock to the X1 pin and leave the X2
pin open.
(17) CVSS (Ground for clock generator)
This is the ground pin for the resonator, PLL and regulator.
(18) VDD (Power supply)
This is the 5 V system positive power supply pin for the peripheral interface.
(19) VSS (Ground)
This is the 5 V system ground pin for the peripheral interface.
User’s Manual U15195EJ5V0UD
41