参数资料
型号: T89C51AC2-RLTIM
厂商: Atmel
文件页数: 43/121页
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44VQFP
标准包装: 160
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LQFP
包装: 托盘
28
A/T89C51AC2
4127H–8051–02/08
Registers
Table 18. PSW Register
PSW (S:D0h)
Program Status Word Register
Reset Value = 0000 0000b
Table 19. AUXR Register
AUXR (S:8Eh)
Auxiliary Register
7
6
5
4
3
2
1
0
CY
AC
F0
RS1
RS0
OV
F1
P
Bit
Number
Bit
Mnemonic Description
7
CY
Carry Flag
Carry out from bit 1 of ALU operands.
6
AC
Auxiliary Carry Flag
Carry out from bit 1 of addition operands.
5
F0
User Definable Flag 0.
4-3
RS1:0
Register Bank Select Bits
Refer to Table 16 for bits description.
2
OV
Overflow Flag
Overflow set by arithmetic operations.
1
F1
User Definable Flag 1
0
P
Parity Bit
Set when ACC contains an odd number of 1’s.
Cleared when ACC contains an even number of 1’s.
7
6
5
4
3
2
1
0
-
M0
-
XRS1
XRS0
EXTRAM
A0
Bit
Number
Bit
Mnemonic Description
7-6
-
Reserved
The value read from these bits are indeterminate. Do not set this bit.
5
M0
Stretch MOVX control:
the RD/ and the WR/ pulse length is increased according to the value of M0.
M0 Pulse length in clock period
0
6
1
30
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3-2
XRS1-0
XRAM size:
Accessible size of the XRAM
XRS
1:0
XRAM size
0
256 Bytes
0
1
512 Bytes
1
0
768 Bytes
1
1024 Bytes (default)
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