DS1977
Figure 7-1. MEMORY/CONTROL FUNCTION FLOW CHART
Master TX Memory
Function Command
From ROM Functions
Flow Chart (Figure 9)
0Fh
Write
N
AAh
Read
N
To Figure 7
2 nd Part
Scratchpad
Y
Master TX
TA1 (T7:T0), TA2 (T15:T8)
Scratchpad
Y
Master RX
TA1 (T7:T0)
Address of
Password?
N
DS1977 sets Scratch-
pad Offset = (T5:T0)
and Clears (PF, AA)
Master TX Data Byte
to Scratchpad Offset
DS1977 sets (E5:E0)
= Scratchpad Offset
Y
DS1977 sets Scratchpad
Offset = (T5:T3,0,0,0) and
Clears (PF, AA, T2:T0)
Master TX one or both
8-byte passwords
Master RX
TA2 (T15:T8)
Master RX Ending
Offset with Data
Status (E/S)
DS1977 sets Scratch-
pad Offset = (T5:T0)
Master RX Data Byte
from Scratchpad Offset
DS1977 Incre-
Master
TX Reset?
Y
DS1977 Incre-
Master
TX Reset?
Y
ments Scratch-
pad Offset
N
Scratch-
pad Offset =
ments Scratch-
pad Offset
N
Scratch-
pad Offset =
N
3Fh?
Y
Partial
Byte Written?
Y
N
3Fh?
Y
Y
Master
TX Reset?
N
PF = 1
Master RX CRC16 of
Command, Address Data,
E/S Byte, and Data Starting
at the Target Address
N
Master RX CRC16 of
Command, Address Data
Y
Master
TX Reset?
Y
Master
TX Reset?
N
Master RX "1"s
11 of 29
N
Master RX "1"s
To ROM Functions
Flow Chart (Figure 9)
From Figure 7
2 nd Part
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相关代理商/技术参数
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DS1981U-F3-1125+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F3-114C+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F5-1124+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F5-1126+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F5-1130+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1981U-F5-1136+ 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
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