CHAPTER 2 PIN FUNCTIONS
57
User’s Manual U14492EJ3V0UD
(15) MODE0 to MODE2 (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 modes
0 and 1 and ROMless modes 0 and 1 (see
3.3 Operation Modes
for details). The operation mode is
determined by sampling the status of each of pins MODE0 to MODE2 on a reset.
Fix these so that the input level does not change during operation.
(a)
µµµµ
PD703116
MODE2
MODE1
MODE0
Operation Mode
L
L
L
ROMless mode 0
L
L
H
ROMless mode 1
L
H
L
Single-chip mode 0
L
H
H
Normal operation mode
Single-chip mode 1
Other than above
Setting prohibited
(b)
µµµµ
PD70F3116
V
PP
MODE2 MODE1 MODE0
Operation Mode
0 V
L
L
L
ROMless mode 0
0 V
L
L
H
ROMless mode 1
0 V
L
H
L
Single-chip mode 0
0 V
L
H
H
Normal operation mode
Single-chip mode 1
7.8 V
L
H
×
Flash memory programming mode
Other than above
Setting prohibited
Remark
L: Low-level input
H: High-level input
×
: don’t care
(16) 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).
(17) X1, X2 (Crystal)
These pins connect a resonator for system clock generation.
They also can input external clocks. For external clock input, connect to the X1 pin and leave the X2 pin
open.
(18) CV
DD
(Power supply for clock generator)
This is the positive power supply pin for the clock generator.
(19) CV
SS
(Ground for clock generator)
This is the ground pin for the clock generator.
Содержание V850E/IA1 mPD703116
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