p89c668hbbd NXP Semiconductors, p89c668hbbd Datasheet - Page 8

• Manufacturer Part Number: p89c668hbbd
• Description: 80c51 8-bit Flash Microcontroller Family
• Manufacturer: NXP Semiconductors

Philips Semiconductors
NOTE:
To avoid “latch-up” effect at power-on, the voltage on any pin (other than V
2002 Oct 28
EA/V
XTAL1
XTAL2
MNEMONIC
MNEMONIC
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM
PP
PLCC
PIN NUMBER
35
21
20
LQFP
29
15
14
TYPE
TYPE
O
I
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. This pin also receives the
programming supply voltage (V
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator
circuits.
Crystal 2: Output from the inverting oscillator amplifier.
8
PP
) must not be higher than V
PP
) during Flash programming.
NAME AND FUNCTION
NAME AND FUNCTION
P89C660/P89C662/P89C664/
CC
+ 0.5 V or less than V
P89C668
SS
Product data
– 0.5 V.