参数资料
型号: PIC16C64A-20/PT
厂商: Microchip Technology
文件页数: 111/126页
文件大小: 0K
描述: IC MCU OTP 2KX14 PWM 44TQFP
产品培训模块: Asynchronous Stimulus
标准包装: 160
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 33
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: OTP
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 6 V
振荡器型: 外部
工作温度: 0°C ~ 70°C
封装/外壳: 44-TQFP
包装: 托盘
85
AT90S/LS4433
1042H–AVR–04/03
Memory
Programming
Program and Data
Memory Lock Bits
The AT90S4433 MCU provides two Lock bits, which can be left unprogrammed (“1”) or
can be programmed (“0”) to obtain the additional features listed in Table 28. The Lock
bits can only be erased with the Chip Erase command.
Note:
1. In Parallel mode, programming of the Fuse bits are also disabled. Program the Fuse
bits before programming the Lock bits.
Fuse Bits
The AT90S4433 has six Fuse bits, SPIEN, BODLEVEL, BODEN and CKSEL2..0.
When the SPIEN Fuse is programmed (“0”), Serial Program and Data Downloading
is enabled. Default value is programmed (“0”). This bit is not accessible in Serial
Programming mode.
The BODLEVEL Fuse selects the Brown-out Detection Level and changes the start-
up times. See “Brown-out Detection” on page 25. Default value is unprogrammed
(“1”).
When the BODEN Fuse is programmed (“0”), the Brown-out Detector is enabled.
See “Brown-out Detection” on page 25. Default value is unprogrammed (“1”).
CKSEL2..0: See Table 5 on page 23 for which combination of CKSEL2..0 to use.
Default value is “010”.
Signature Bytes
All Atmel microcontrollers have a 3-byte signature code that identifies the device. This
code can be read in both serial and parallel mode. The three bytes reside in a separate
address space.
For the AT90S4433(1) they are:
1.
$000: $1E (indicates manufactured by Atmel)
2.
$001: $92 (indicates 4 KB Flash memory)
3.
$002: $03 (indicates AT90S4433 device when signature byte $001 is $92)
Note:
1. When both Lock bits are programmed (Lock mode 3), the signature bytes cannot be
read in Serial mode. Reading the signature bytes will return $00, $01 and $02.
Table 28. Lock Bit Protection Modes
Memory Lock Bits
Protection Type
Mode
LB1
LB2
1
No memory lock features enabled.
2
0
1
Further programming of the Flash and EEPROM is disabled.
3
0
Same as mode 2, and verify is also disabled.
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