参数资料
型号: AT91SAM7S256C-MU
厂商: Atmel
文件页数: 114/165页
文件大小: 0K
描述: IC ARM7 MCU 32BIT 256K 64QFN
标准包装: 260
系列: SAM7S
核心处理器: ARM7
芯体尺寸: 16/32-位
速度: 55MHz
连通性: I²C,SPI,SSC,UART/USART,USB
外围设备: 欠压检测/复位,DMA,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 256KB(256K x 8)
程序存储器类型: 闪存
RAM 容量: 64K x 8
电压 - 电源 (Vcc/Vdd): 1.65 V ~ 1.95 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-VFQFN 裸露焊盘
包装: 托盘
52
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
For further details on the Debug Unit, see the Debug Unit section.
12.5.4
IEEE 1149.1 JTAG Boundary Scan
IEEE 1149.1 JTAG Boundary Scan allows pin-level access independent of the device packaging technology.
IEEE 1149.1 JTAG Boundary Scan is enabled when JTAGSEL is high. The SAMPLE, EXTEST and BYPASS func-
tions are implemented. In ICE debug mode, the ARM processor responds with a non-JTAG chip ID that identifies
the processor to the ICE system. This is not IEEE 1149.1 JTAG-compliant.
It is not possible to switch directly between JTAG and ICE operations. A chip reset must be performed after JTAG-
SEL is changed.
A Boundary-scan Descriptor Language (BSDL) file is provided to set up testing.
12.5.4.1
JTAG Boundary-scan Register
The Boundary-scan Register (BSR) contains 96 bits that correspond to active pins and associated control signals.
Each SAM7Sxx input/output pin corresponds to a 3-bit register in the BSR. The OUTPUT bit contains data that
can be forced on the pad. The INPUT bit facilitates the observability of data applied to the pad. The CONTROL bit
selects the direction of the pad.
AT91SAM7S128 Rev B
0x270A0741
AT91SAM7S128 Rev C
0x270A0742
AT91SAM7S128 Rev D
0x270A0743
AT91SAM7S256 Rev A
0x270D0940
AT91SAM7S256 Rev B
0x270B0941
AT91SAM7S256 Rev C
0x270B0942
AT91SAM7S256 Rev D
0x270B0943
AT91SAM7S512 Rev A
0x270B0A40
AT91SAM7S512 Rev B
0x270B0A4F
Table 12-2.
SAM7S Series Debug Unit Chip ID (Continued)
Table 12-3.
SAM7Sxx JTAG Boundary Scan Register
Bit Number
Pin Name
Pin Type
Associated BSR
Cells
96
PA17/PGMD5/AD0
IN/OUT
INPUT
95
OUTPUT
94
CONTROL
93
PA18/PGMD6/AD1
IN/OUT
INPUT
92
OUTPUT
91
CONTROL
90
PA21/PGMD9*
IN/OUT*
INPUT
89
OUTPUT(1)
88
CONTROL(1)
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