参数资料
型号: AT89C51AC3-SLSIM
厂商: Atmel
文件页数: 60/140页
文件大小: 0K
描述: IC 8051 MCU FLASH 64K 44PLCC
标准包装: 27
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 36
程序存储器容量: 64KB(64K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 2.25K 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-LCC(J 形引线)
包装: 管件
dsPIC33FJXXXGPX06/X08/X10
DS70286C-page 24
2009 Microchip Technology Inc.
3.4
CPU Control Registers
CPU control registers include:
REGISTER 3-1:
SR: CPU STATUS REGISTER
R-0
R/C-0
R-0
R/C-0
R -0
R/W-0
OA
OB
SA(1)
SB(1)
OAB
SAB
DA
DC
bit 15
bit 8
R/W-0(2)
R/W-0(3)
R-0
R/W-0
IPL<2:0>(2)
RA
N
OV
Z
C
bit 7
bit 0
Legend:
C = Clear only bit
R = Readable bit
U = Unimplemented bit, read as ‘0’
S = Set only bit
W = Writable bit
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
OA: Accumulator A Overflow Status bit
1
= Accumulator A overflowed
0
= Accumulator A has not overflowed
bit 14
OB: Accumulator B Overflow Status bit
1
= Accumulator B overflowed
0
= Accumulator B has not overflowed
bit 13
SA: Accumulator A Saturation ‘Sticky’ Status bit(1)
1
= Accumulator A is saturated or has been saturated at some time
0
= Accumulator A is not saturated
bit 12
SB: Accumulator B Saturation ‘Sticky’ Status bit(1)
1
= Accumulator B is saturated or has been saturated at some time
0
= Accumulator B is not saturated
bit 11
OAB: OA || OB Combined Accumulator Overflow Status bit
1
= Accumulators A or B have overflowed
0
= Neither Accumulators A or B have overflowed
bit 10
SAB: SA || SB Combined Accumulator ‘Sticky’ Status bit
1
= Accumulators A or B are saturated or have been saturated at some time in the past
0
= Neither Accumulator A or B are saturated
Note:
This bit may be read or cleared (not set). Clearing this bit will clear SA and SB.
bit 9
DA: DO Loop Active bit
1
= DO loop in progress
0
= DO loop not in progress
Note 1: This bit may be read or cleared (not set).
2: The IPL<2:0> bits are concatenated with the IPL<3> bit (CORCON<3>) to form the CPU Interrupt Priority
Level. The value in parentheses indicates the IPL if IPL<3> = 1. User interrupts are disabled when
IPL<3> = 1.
3: The IPL<2:0> Status bits are read only when NSTDIS = 1 (INTCON1<15>).
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