AT89LP216-20PI datasheet(71/90 Pages) ATMEL

71 / 90 page

3621A–MICRO–6/06

AT89LP216 [Preliminary]

23.7

User Configuration Fuses

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 Table 23-5. Fuses are cleared by program-

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.

Notes:

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.

Table 23-5.

User Configuration Fuse Definitions

Address

Fuse Name

Description

00 – 01h

Clock Source – CS[0:1](2)

Selects source for the system clock:

CS1

CS0

Selected Source

00h

Crystal Oscillator (XTAL)

00h

FFh

Reserved

FFh

00h

External Clock on XTAL1 (XCLK)

FFh

Internal RC Oscillator (IRC)

02 – 03h

Start-up Time – SUT[0:1]

Selects time-out delay for the POR/BOD/PWD wake-up period:

SUT1

SUT0

Selected Time-out

00h

1 ms (XTAL); 16 µs (XCLK/IRC)

00h

FFh

2 ms (XTAL); 512 µs (XCLK/IRC)

FFh

00h

4ms (XTAL); 1ms (XCLK/IRC)

FFh

16 ms (XTAL); 4 ms (XCLK/IRC)

04h

Reset Pin Enable(3)

FFh: RST pin functions as reset

00h: RST pin functions as general purpose I/O

05h

Brown-Out Detector Enable

FFh: Brown-out Detector Enabled

00h: Brown-out Detector Disabled

06h

On-Chip Debug Enable

FFh: On-Chip Debug Disabled

00h: On-Chip Debug Enabled

07h

ISP Enable(3)

FFh: In-System Programming Enabled

00h: In-System Programming Disabled (Enabled at POR only)

08 – 0FH

RC Oscillator Frequency

Adjustment [0:7]

Adjusts the frequency of the internal RC oscillator.

10H

User Signature Programming

FFh: Programming of User Signature Disabled

00h: Programming of User Signature Enabled

11H

Tristate Ports

FFh: I/O Ports start in input-only mode (tristated) after reset

00h: I/O Ports start in quasi-bidirectional mode after reset

12H

OCD Interface Select

FFh: Normal two-wire interface

00h: Fast two-wire interface

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