参数资料
型号: P89C668HFA
厂商: NXP SEMICONDUCTORS
元件分类: 微控制器/微处理器
英文描述: 80C51 8-bit Flash microcontroller family 64KB ISP FLASH with 8KB RAM
中文描述: 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, MS-018, SOT-187-2, LCC-44
文件页数: 6/54页
文件大小: 299K
代理商: P89C668HFA
Philips Semiconductors
Preliminary data
P89C668
80C51 8-bit Flash microcontroller family
64KB ISP Flash with 8KB RAM
2001 Jul 27
6
MNEMONIC
NAME AND FUNCTION
PIN NUMBER
LQFP
PLCC
EA/V
PP
35
29
I
External Access Enable/Programming Supply Voltage:
EA must be externally held low to
enable the device to fetch code from external program memory locations. If EA is held high, the
device executes from internal program memory. The value on the EA pin is latched when RST is
released and any subsequent changes have no effect. Since the P89C668 has 64k internal
memory, the P89C668 will execute only from internal memory when EA is held high. This pin also
receives the programming supply voltage (V
PP
) during Flash programming.
XTAL1
21
15
I
Crystal 1:
Input to the inverting oscillator amplifier and input to the internal clock generator circuits.
XTAL2
20
14
O
Crystal 2:
Output from the inverting oscillator amplifier.
NOTE:
To avoid “latch-up” effect at power-on, the voltage on any pin (other than V
PP
) must not be higher than V
CC
+ 0.5 V or less than V
SS
– 0.5 V.
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