Z8F1601 Datasheet, PDF (142/246 Pages) Zilog, Inc. – Z8 Encore Microcontrollers with Flash Memory and 10-Bit A/D Converter

Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
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If the current ADC Analog Input is not the highest numbered input to be converted,
DMA_ADC initiates data conversion in the next higher numbered ADC Analog Input.
Configuring DMA_ADC for Data Transfer
Follow these steps to configure and enable DMA_ADC:
1. Write the DMA_ADC Address register with the 7 most-significant bits of the Register
File address for data transfers.
2. Write to the DMA_ADC Control register to complete the following:
– Enable the DMA_ADC interrupt request, if desired
– Select the number of ADC Analog Inputs to convert
– Enable the DMA_ADC channel
Caution:
When using the DMA_ADC to perform conversions on multiple ADC in-
puts and the ADC_IN field in the DMA_ADC Control Register is greater
than 000b, the Analog-to-Digital Converter must be configured for Single-
Shot mode.
Continuous mode operation of the ADC can only be used in conjunction
with DMA_ADC if the ADC_IN field in the DMA_ADC Control Register
is reset to 000b to enable conversion on ADC Analog Input 0 only.
DMA Control Register Definitions
DMAx Control Register
The DMAx Control register is used to enable and select the mode of operation for DMAx.
Table 71. DMAx Control Register (DMAxCTL)
BITS
7
6
5
4
3
2
1
0
FIELD ^DEN
DLE
DDIR IRQEN WSEL
RSS
RESET
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
ADDR
FB0H, FB8H
DEN—DMAx Enable
0 = DMAx is disabled and data transfer requests are disregarded.
PS017610-0404
Direct Memory Access Controller