參數(shù)資料
型號(hào)： M30221MC-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP120
封裝： PLASTIC, LQFP-120
文件頁(yè)數(shù)： 4/45頁(yè)
文件大?。?/td> 346K
代理商： M30221MC-XXXFP
12
Reset
Mitsubishi microcomputers
M30221 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
____________
Table 1.6.1 shows the statuses of the other pins while the RESET pin level is “L”. Figures 1.6.3 and 1.6.4
show the internal status of the microcomputer immediately after the reset is cancelled.
____________
Table 1.6.1. Pin status when RESET pin level is “L”
Status
Pin name
SEG2 to SEG15
P0, P10 to P12
Input port(with a pull up resistor)
Input port (floating)
“H” level is output
COM0 to COM3
P1 to P9, P13
Figure 1.6.2. Reset sequence
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” (0.2VCC max.) for at least 20 cycles. When the reset pin level is then returned to the “H”
level while main clock is stable, the reset status is cancelled and program execution resumes from the
address in the reset vector table.
Figure 1.6.1 shows the example reset circuit. Figure 1.6.2 shows the reset sequence.
Figure 1.6.1. Example reset circuit
XIN
Address
(Internal Address signal)
FFFFE16
FFFFC16
More than 20 cycles are needed
BCLK
BCLK 24 cycles
RESET
Content of reset vector
RESET
VCC
0.8V
RESET
VCC
0V
5V
4.0V
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