AT89LP216 Atmel Corporation, AT89LP216 Datasheet - Page 71

• Manufacturer Part Number: AT89LP216
• Manufacturer: Atmel Corporation

Specifications of AT89LP216

• Flash (kbytes): 2 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 14
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.125
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 2
• Isp: SPI/OCD
• Watchdog: Yes

24.7
Table 24-5.
Notes:
3621E–MICRO–11/10
Address
00 – 01h
02 – 03h
04h
05h
06h
07h
08 – 0FH
10H
11H
12H
User Configuration Fuses
1. The default state for all fuses is FFh.
2. Changes to these fuses will only take effect after a device POR.
3. Changes to these fuses will only take effect after the ISP session terminates by bringing RST high.
4. AIN0 (P1.0) and AIN1 (P1.1) always reset to input-only mode. SS (P1.4) always resets to quasi-bidirectional mode.
Fuse Name
Clock Source – CS[0:1]
Start-up Time – SUT[0:1]
Reset Pin Enable
Brown-out Detector Enable
On-chip Debug Enable
ISP Enable
RC Oscillator Frequency
Adjustment [0:7]
User Signature Programming
Tristate Ports
OCD Interface Select
User Configuration Fuse Definitions
(3)
(4)
The AT89LP216 includes 19 user fuses for configuration of the device. Each fuse is accessed at
a separate address in the User Fuse Row as listed in
ming 00h to their locations. Programming FFh to fuse location will cause that fuse to maintain its
previous state. To set a fuse (set to FFh) the fuse row must be erased and then reprogrammed
using the Fuse Write with Auto-erase command. The default state for all fuses is FFh.
(3)
(2)
Description
Selects source for the system clock:
CS1
00h
00h
FFh
FFh
Selects time-out delay for the POR/BOD/PWD wake-up period:
SUT1
00h
00h
FFh
FFh
FFh: RST pin functions as reset
00h: RST pin functions as general purpose I/O
FFh: Brown-out Detector Enabled
00h: Brown-out Detector Disabled
FFh: On-chip Debug Disabled
00h: On-chip Debug Enabled
FFh: In-System Programming Enabled
00h: In-System Programming Disabled (Enabled at POR only)
Adjusts the frequency of the internal RC oscillator. A copy of the 8MHz factory
setting is stored at location 0008h of the Atmel Signature.
FFh: Programming of User Signature Disabled
00h: Programming of User Signature Enabled
FFh: I/O Ports start in input-only mode (tristated) after reset
00h: I/O Ports start in quasi-bidirectional mode after reset
FFh: Fast two-wire interface
00h: Do not use
CS0
00h
FFh
00h
FFh
SUT0
00h
FFh
00h
FFh
Selected Source
Crystal Oscillator (XTAL)
Reserved
External Clock on XTAL1 (XCLK)
Internal RC Oscillator (IRC)
Selected Time-out
1 ms (XTAL); 16 µs (XCLK/IRC)
2 ms (XTAL); 512 µs (XCLK/IRC)
4 ms (XTAL); 1 ms (XCLK/IRC)
16 ms (XTAL); 4 ms (XCLK/IRC)
Table
24-5. Fuses are cleared by program-
AT89LP216
71