C8051F410DK Silicon Laboratories Inc, C8051F410DK Datasheet - Page 70
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C8051F410DK
Manufacturer Part Number
C8051F410DK
Description
KIT DEV FOR C8051F41X
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F410DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F41x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F410
Silicon Family Name
C8051F41x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051F41x
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1314
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F410DK
Manufacturer:
Silicon Labs
Quantity:
135
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C8051F410/1/2/3
6.1.2. Update Output Based on Timer Overflow
The IDAC output update can be scheduled on a Timer overflow. This feature is useful in systems where the
IDAC is used to generate a waveform of a defined sampling rate, by eliminating the effects of variable
interrupt latency and instruction execution on the timing of the IDAC output. When the IDAnCM bits
(IDAnCN.[6:4]) are set to ‘000’, ‘001’, ‘010’ or ‘011’, writes to both IDAC data registers (IDAnL and IDAnH)
are held until an associated Timer overflow event (Timer 0, Timer 1, Timer 2 or Timer 3, respectively)
occurs, at which time the IDAnH:IDAnL contents are copied to the IDAC input latch, allowing the IDAC out-
put to change to the new value. When updates are scheduled based on Timer 2 or 3, updates occur on
low-byte overflows if Timer 2 or 3 is in 8-bit mode and high-byte overflows if Timer 2 or 3 is in 16-bit mode.
6.1.3. Update Output Based on CNVSTR Edge
The IDAC output can also be configured to update on a rising edge, falling edge, or both edges of the
external CNVSTR signal. When the IDAnCM bits (IDAnCN.[6:4]) are set to ‘100’, ‘101’, or ‘110’, writes to
the IDAC data registers (IDAnL and IDAnH) are held until an edge occurs on the CNVSTR input pin. The
particular setting of the IDAnCM bits determines whether the IDAC output is updated on rising, falling, or
both edges of CNVSTR. When a corresponding edge occurs, the IDAnH:IDAnL contents are copied to the
IDAC input latch, allowing the IDAC output to change to the new value.
6.2.
The IDAC data word can be Left Justified or Right Justified as shown in Figure 6.2. When Left Justified, the
8 MSBs of the data word (D11-D4) are mapped to bits 7-0 of the IDAnH register and the 4 LSBs of the data
word (D3-D0) are mapped to bits 7-4 of the IDAnL register. When Right Justified, the 4 MSBs of the data
word (D11-D8) are mapped to bits 3-0 of the IDAnH register and the 8 LSBs of the data word (D7-D0) are
mapped to bits 7-0 of the IDAnL register. The IDAC data word justification is selected using the IDAnRJST
bit (IDAnCN.2).
The full-scale output current of the IDAC is selected using the IDAnOMD bits (IDAnCN[1:0]). By default,
the IDAC is set to a full-scale output current of 2 mA. The IDAnOMD bits can also be configured to provide
full-scale output currents of 0.25 mA, 0.5 mA, or 1 mA.
70
Left Justified Data (IDAnRJST = 0):
Right Justified Data (IDAnRJST = 1):
IDAn Data Word
D11
(D11–D0)
IDAC Output Mapping
0xFFF
0x000
0x001
0x800
D10
D9
2048/4096 x 2 mA 2048/4096 x 1 mA 2048/4096 x 0.5 mA 2048/4096 x 0.25 mA
4095/4096 x 2 mA 4095/4096 x 1 mA 4095/4096 x 0.5 mA 4095/4096 x 0.25 mA
D8
1/4096 x 2 mA
IDAnH
IDAnH
‘11’ (2 mA)
0 mA
Figure 6.2. IDAC Data Word Mapping
D11
D7
D10
D6
Output Current vs IDAnOMD bit setting
D5
D9
1/4096 x 1 mA
‘10’ (1 mA)
0 mA
D4
D8
Rev. 1.1
D3
D7
D2
D6
1/4096 x 0.5 mA
‘01’ (0.5 mA)
D1
D5
0 mA
D0
D4
IDAnL
IDAnL
D3
1/4096 x 0.25 mA
‘00’ (0.25 mA)
D2
0 mA
D1
D0
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