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參數資料
| 型號： | 935263358512 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | 7.50 MM, SO-20 |
| 文件頁數： | 22/58頁 |
| 文件大?。?/td> | 312K |
| 代理商： | 935263358512 |
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Philips Semiconductors
Preliminary specification
87LPC764
Low power, low price, low pin count (20 pin)
microcontroller with 4 kB OTP
2000 Jun 01
26
Low Voltage EPROM Operation
The EPROM array contains some analog circuits that are not
required when VDD is less than 4 V, but are required for a VDD
greater than 4 V. The LPEP bit (AUXR.4), when set by software, will
power down these analog circuits resulting in a reduced supply
current. LPEP is cleared only by power-on reset, so it may be set
ONLY for applications that always operate with VDD less than 4 V.
Reset
The 87LPC764 has an active low reset input when configured for an
external reset. A fully internal reset may also be configured which
provides a reset when power is initially applied to the device. The
watchdog timer can act as an oscillator fail detect because it uses
an independent, fully on-chip oscillator.
The external reset input is disabled, and fully internal reset
generation enabled, by programming the RPD bit in the EPROM
configuration register UCFG1 to 0. EPROM configuration is
described in the section EPROM Characteristics
SU01169
87LPC764
VDD
8.2 k
W
10
mF
RST
2.2
mF
Figure 20. Typical External Reset Circuits
SU01170
CHIP RESET
CPU
CLOCK
Q
RESET
TIMING
RPD (UCFG1.6)
WDT
MODULE
SOFTWARE RESET
SRST (AUXR1.3)
POWER MONITOR
RESET
RST/VPP PIN
WDTE (UCFG1.7)
S
R
Figure 21. Block Diagram Showing Reset Sources
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