AT89C5131A-RDTIM Atmel, AT89C5131A-RDTIM Datasheet - Page 38
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
AT89C5131A-RDTIM
Manufacturer Part Number
AT89C5131A-RDTIM
Description
C5131A 32K FLASH USB VQFP64 IND, 5V
Manufacturer
Atmel
Datasheet
1.AT89C5131A-RDTIM.pdf
(176 pages)
- Current page: 38 of 176
- Download datasheet (3Mb)
Default Values
Software Registers
4136C–USB–04/05
Table 38. Program Lock bits
Notes:
These security bits protect the code access through the parallel programming interface.
They are set by default to level 4. The code access through the ISP is still possible and
is controlled by the “software security bits” which are stored in the extra Flash memory
accessed by the ISP firmware.
To load a new application with the parallel programmer, a chip erase must be done first.
This will set the HSB in its inactive state and will erase the Flash memory. The part ref-
erence can always be read using Flash parallel programming modes.
The default value of the HSB provides parts ready to be programmed with ISP:
•
•
•
•
Several registers are used, in factory and by parallel programmers, to make copies of
hardware registers contents. These values are used by Atmel ISP (see Section “In-Sys-
tem Programming (ISP)”).
These registers are in the “Extra Flash Memory” part of the Flash memory. This block is
also called ”XAF” or eXtra Array Flash. They are accessed in the following ways:
•
•
•
Several software registers are described in Table 39.
Security level
BLJB: Cleared to force ISP operation.
X2: Set to force X1 mode (Standard Mode)
OSCON1-0: Set to start with 32 MHz oscillator configuration value.
LB2-0: Security level four to protect the code from a parallel access with maximum
security.
Commands issued by the parallel memory programmer.
Commands issued by the ISP software.
Calls of API issued by the application software.
1
2
3
4
1. U: unprogrammed or “one” level.
2. P: programmed or “zero” level.
3. X: don’t care
4. WARNING: Security level 2 and 3 should only be programmed after Flash and code
verification.
Program Lock Bits
LB0
U
P
X
X
LB1
U
U
P
X
LB2
U
U
U
P
Protection Description
No program lock features enabled.
MOVC instruction executed from external
program memory is disabled from fetching code
bytes from any internal memory, EA is sampled
and latched on reset, and further parallel
programming of the Flash and of the EEPROM
(boot and Xdata) is disabled. ISP and software
programming with API are still allowed.
Same as 2, also verify through parallel
programming interface is disabled and serial
programming ISP is disabled.
Same as 3, also external execution is disabled.
AT89C5131
37
Related parts for AT89C5131A-RDTIM
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![AT89C5131A-L](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
![AT89C5131A-M](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
![AT89C5131A-PUTUM](/photos/12/13/121309/313-32-qfn_tmb.jpg)
Part Number:
Description:
IC 8051 MCU FLASH 32K USB 32QFN
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-S3SUM](/photos/12/13/121324/453-52-plcc_tmb.jpg)
Part Number:
Description:
IC 8051 MCU FLASH 32K USB 52PLCC
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-PLTUL](/photos/7/34/73471/48-vqfn-6_543-5130_01-4_tmb.jpg)
Part Number:
Description:
IC MCU 32KB 3-3.6V USB 48-VQFN
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-TIRUL](/photos/6/82/68295/453-28-soic_tmb.jpg)
Part Number:
Description:
MCU 8051 32K FLASH USB 28-SOIC
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-RDTUM](/photos/6/81/68127/313-64-vqfp_tmb.jpg)
Part Number:
Description:
IC 8051 MCU FLASH 32K USB 64VQFP
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-RDTUL](/photos/6/81/68127/313-64-vqfp_tmb.jpg)
Part Number:
Description:
MCU 8051 32K FLASH USB 64-VQFP
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-TISUL](/photos/6/82/68295/453-28-soic_tmb.jpg)
Part Number:
Description:
MCU 8051 32K FLASH USB 28-SOIC
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-S3SUL](/photos/12/13/121324/453-52-plcc_tmb.jpg)
Part Number:
Description:
MCU 8051 32K FLASH USB 52-PLCC
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-PLTIL](/photos/7/34/73471/48-vqfn-6_543-5130_01-4_tmb.jpg)
Part Number:
Description:
IC 8051 MCU FLASH 32K USB 48QFN
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-RDTIL](/photos/6/81/68127/313-64-vqfp_tmb.jpg)
Part Number:
Description:
IC 8051 MCU FLASH 32K USB 64VQFP
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-PUTIM](/photos/12/13/121309/313-32-qfn_tmb.jpg)
Part Number:
Description:
IC 8051 MCU FLASH 32K USB 32QFN
Manufacturer:
Atmel
Datasheet:
![AT89C5131A-S3SIM](/photos/12/13/121324/453-52-plcc_tmb.jpg)
Part Number:
Description:
IC 8051 MCU FLASH 32K USB 52PLCC
Manufacturer:
Atmel
Datasheet: