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| 型号： | 7548 |
| 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： | 1255K |
| 代理商： | 7548 |
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Rev.2.00
REJ03B0210-0200
Mar 15, 2007
Page 41 of 70
7548 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 54. Operation waveform diagram of power-on
reset circuit
Fig 55. Operation waveform diagram of low voltage detection circuit
Fig 56. 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:1.95 V)
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
相关PDF资料 |
PDF描述 |
|---|---|
| 7549 | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 75HQ | SCHOTTKY RECTIFIER |
| 75HQ030 | SCHOTTKY RECTIFIER |
| 75HQ035 | SCHOTTKY RECTIFIER |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 7548_07 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:Standard Characteristics |
| 7548_0710 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 75481-001 | 功能描述:集管和线壳 BACKPANEL PINS RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
| 75481-002 | 功能描述:集管和线壳 BERGPIN - WITH LARGE STA-R RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
| 75481-004 | 功能描述:集管和线壳 BERGPIN RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
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