参数资料
型号: AT90S8515-8AC
厂商: Atmel
文件页数: 29/112页
文件大小: 0K
描述: IC MCU 8K FLSH 8MHZ 44TQFP
标准包装: 160
系列: AVR® 90S
核心处理器: AVR
芯体尺寸: 8-位
速度: 8MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 8KB(4K x 16)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 6 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 44-TQFP
包装: 托盘
23
AT90S8515
0841G–09/01
$00f
ldi r16,low(RAMEND)
$010
out SPL,r16
$011
<instr>
xxx
……
Reset Sources
The AT90S8515 has three sources of reset:
Power-on Reset. The MCU is reset when the supply voltage is below the Power-on
Reset threshold (V
POT).
External Reset. The MCU is reset when a low level is present on the RESET pin for
more than 50 ns.
Watchdog Reset. The MCU is reset when the Watchdog timer period expires and
the Watchdog is enabled.
During reset, all I/O registers are set to their initial values and the program starts execu-
tion from address $000. The instruction placed in address $000 must be an RJMP
(relative jump) instruction to the reset handling routine. If the program never enables an
interrupt source, the interrupt vectors are not used and regular program code can be
placed at these locations. The circuit diagram in Figure 23 shows the reset logic. Table 3
defines the timing and electrical parameters of the reset circuitry.
Figure 23. Reset Logic
Note:
The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling).
Table 3. Reset Characteristics
Symbol
Parameter
Min
Typ
Max
Units
V
POT
Power-on Reset Threshold Voltage (rising)
0.8
1.2
1.6
V
Power-on Reset Threshold Voltage (falling)
0.2
0.4
0.6
V
RST
RESET Pin Threshold Voltage
––
0.9 VCC
V
t
TOUT
Reset Delay Time-out Period FSTRT
Unprogrammed
11.0
16.0
21.0
ms
t
TOUT
Reset Delay Time-out Period FSTRT
Programmed
0.25
0.28
0.31
ms
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