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M32C/86 数据表(PDF) 60 Page - Renesas Technology Corp

部件名 M32C/86
功能描述  RENESAS 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES
PDF  505 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

M32C/86 数据表(HTML) 60 Page - Renesas Technology Corp

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Page 37
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5. Reset
Hardware reset 1, brown-out detection reset (hardware reset 2), software reset and watchdog timer reset
are available to reset the microcomputer.
5.1 Hardware Reset 1
____________
Pins, the CPU and SFR are reset by setting the RESET pin. If the supply voltage meets the recommended
___________
operating conditions, all pins are reset when a low-level ("L") signal is applied to the RESET pin (see Table
5.1). The oscillation circuit is also reset and the main clock starts oscillating. The CPU and SFR are reset
____________
when the signal applied to the RESET pin changes "L" to high level ("H"). The microcomputer executes the
program in an address indicated by the reset vector. The internal RAM is not reset. When an "L" signal is
____________
applied to the RESET pin while writing data to the internal RAM, the internal RAM is in an indeterminate
state.
Figure 5.1 shows an example of the reset circuit. Figure 5.2 shows a reset sequence. Table 5.1 lists pin
____________
states while the RESET pin is held "L".
5.1.1 Reset on a Stable Supply Voltage
____________
(1) Apply an "L" signal to the RESET pin
(2) Provide 20 or more clock cycle inputs into the XIN pin
____________
(3) Apply an "H" signal to the RESET pin
5.1.2 Power-on Reset
____________
(1) Apply an "L" signal to the RESET pin
(2) Raise the supply voltage to the recommended operating level
(3) Insert
td(P-R) ms as wait time for the internal voltage to stabilize
(4) Provide 20 or more clock cycle inputs into the XIN pin
____________
(5) Apply an "H" signal to the RESET pin
Figure 5.1 Reset Circuit
RESET
VCC
RESET
VCC
0V
0V
Recommended
operating voltage
0.2VCC or below
0.2VCC
or below
td(P-R) + 20 or more clock cycle
inputs provided into the XIN pin



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