AT89LP214 Atmel Corporation, AT89LP214 Datasheet - Page 23

• Manufacturer Part Number: AT89LP214
• Manufacturer: Atmel Corporation

Specifications of AT89LP214

• Flash (kbytes): 2 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 12
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.125
• Operating Voltage (vcc): 2.4 to 5.0
• Timers: 2
• Isp: SPI/OCD
• Watchdog: Yes

Table 12-4.
13. I/O Ports
3538E–MICRO–11/10
Symbol
PGH
PSH
PT1H
PX1H
PT0H
PX0H
IPH = B7H
Not Bit Addressable
Bit
Function
General-purpose Interrupt Priority High
Serial Port Interrupt Priority High
Timer 1 Interrupt Priority High
External Interrupt 1 Priority High
Timer 0 Interrupt Priority High
External Interrupt 0 Priority High
IPH
–
7
– Interrupt Priority High Register
The AT89LP213/214 can be configured for between 9 and 12 I/O pins. The exact number of I/O
pins available depends on the clock and reset options as shown in
5V tolerant as inputs, that is they can be pulled up or driven to 5.5V even when operating at a
lower V
lup is required to convert outputs to CMOS levels.
Table 13-1.
Clock Source
External Crystal or Resonator
External Clock
Internal RC Oscillator
–
6
CC
such as 3V. Inputs use CMOS levels while outputs use TTL levels. An external pul-
I/O Pin Configurations
PGH
5
PSH
4
External RST Pin
No external reset
External RST Pin
No external reset
External RST Pin
No external reset
Reset Option
PT1H
3
PX1H
2
Reset Value = X000 0000B
AT89LP213/214
PT0H
Table
1
Number of I/O Pins
13-1. All port pins are
PX0H
10
10
11
11
12
9
0
23