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| 型号： | 7549 |
| 厂商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 41/73页 |
| 文件大小： | 1272K |
| 代理商： | 7549 |
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Rev.2.00
REJ03B0202-0200
Mar 05, 2007
Page 41 of 70
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Power-on Reset Circuit
Reset can be automatically performed at power on (power-on
reset) by the built-in power-on reset circuit.
To use the built-in power-on reset circuit, leave the RESET pin
open (the pull-up resistor is built-in).
Low Voltage Detection Circuit
The built-in low voltage detection circuit is designed to detect a
drop in voltage and to reset the microcomputer if the power
source voltage drops below a set value (Typ.1.95 V).
The low voltage detection circuit is valid by setting “1” to bit 0
of the function set ROM data 0.
Also, when “1” is set to bit 2 of the function set ROM data 1, the
low voltage detection circuit can be valid even in the stop mode.
The low voltage detection circuit is stopped in the stop mode by
setting “0” to this bit, so that the power dissipation is reduced.
Fig 53. Operation waveform diagram of power-on
reset circuit
Fig 54. Operation waveform diagram of low voltage detection circuit
Fig 55. Timing diagram at reset
V
CC
(
Note
)
Power-on reset circuit output
Internal reset signal
Note:
Keep the value of supply voltage to
the minimum value or more of the
recommended operating conditions.
Reset released
Reset
state
Power-on
V
CC
Internal reset signal
Reset voltage (Typ:1.95V)
Microcomputer starts operation
by the built-in on-chip oscillator.
FFFC
FFFD
ADH,ADL
ADL
ADH
Reset address from the
vector table
Low-speed on-chip
oscillator clock
Internal CPU clock
φ
RESET
Internal reset
signal
SYNC
Address
Data
9 to 16 cycles of
internal CPU clock
φ
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| 75HQ | SCHOTTKY RECTIFIER |
| 75HQ030 | SCHOTTKY RECTIFIER |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 7549_0710 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7549_09 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7-5-4905 | 功能描述:3M 4905 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4905 零件状态:在售 厚度 - 粘合剂:- 厚度 - 底布，载体:- 标准包装:1 |
| 754905-1 | 功能描述:PIN ATT/ROLL AUTO IV 制造商:te connectivity amp connectors 系列:* 零件状态:有效 标准包装:1 |
| 7-5-4910 | 功能描述:3M 4910 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4910 零件状态:在售 底布，载体:丙烯酸泡棉 厚度 - 粘合剂:- 厚度 - 底布，载体:- 标准包装:1 |
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