參數(shù)資料
型號(hào)： M30100
廠商： Renesas Technology Corp.
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機(jī)
文件頁數(shù)： 14/164頁
文件大?。?/td> 3302K
代理商： M30100
deveopment
Reset
Tentative Specifications REV.E1
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30100/M30102 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
13
Figure 1.5.2. Example reset circuit (example voltage check circuit)
Reset
There are two kinds of resets; hardware and software. In both cases, operation is the same after the reset.
(See “Software Reset” for details of software resets.) This section explains on hardware resets.
When the supply voltage is in the range where operation is guaranteed, a reset is effected by holding the
reset pin level “L” (0.2V
CC
max.) for at least 200
μ
sec. When the reset pin level is then returned to the “H”
level, the reset status is cancelled and program execution resumes from the address in the reset vector
table. Since the value of RAM is indeterminate when power is applied, the initial values must be set. Also,
if a reset signal is input during write to RAM, the access to the RAM will be interrupted. Consequently, the
value of the RAM being written may change to an unintended value due to the interruption.
Figures 1.5.1 and 1.5.2 show the example reset circuit. Figure 1.5.3 shows the reset sequence.
Figure 1.5.1. Example reset circuit
RESET
V
CC
Example when V
CC
= 5V
.
0.8V
RESET
V
CC
0V
0V
5V
5V
4.0V
More than 200
μ
sec
BCLK
(Internal clock)
Address
(Internal address
signal)
BCLK 28cycles
FFFFC
16
FFFFE
16
Content of reset vector
Internal ring
oscillation
RESET
More than 20 cycles are needed
Example when V
CC
= 5V
.
V
CC
RESET
Supply voltage
detection circuit
RESET
V
CC
0V
0V
5V
5V
4.0V
More than 200
μ
sec
Figure 1.5.3. Reset sequence
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