HT32F1653 datasheet(17/46 Pages) HOLTEK

17 / 46 page

Rev. 1.00

17 of 46

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3�-bit ARM® Co�tex™-M3 MCU

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Peripheral Direct Memory Access – PDMA

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8 channels with trigger source grouping

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8-/16-/32-bit width data transfer

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Supports Address increment, decrement or fixed mode

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4-level programmable channel priority

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Auto reload mode

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Supports trigger source: ADC, SPI, USART, UART, I2C, I2S, EBI, GPTM, MCTM, SCI and

software request

The Peripheral Direct Memory Access controller, PDMA, moves data between the peripherals

and the system memory on the AHB bus. Each PDMA channel has a source address, destination

address, block length and transfer count. The PDMA can exclude the CPU intervention and avoid

interrupt service routine execution. It improves system performance as the software does not need

to join each data movement operation.

External Bus Interface – EBI

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Programmable interface for various memory types

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Translate the AHB transactions into the appropriate external device protocol

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Memory bank regions and independent chip select control for each memory bank

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Programmable timings to support a wide range of devices

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Includes page read mode

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Automatic translation when the AHB transaction width and external memory interface width is

different

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Write buffer to decrease the stalling of the AHB write burst transaction

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Multiplexed address and data line configurations

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Up to 21 address lines

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Up to 16-bit data bus width

The external bus interface is able to access external parallel interface devices such as SRAM,

Flash and LCD modules. The interface is memory mapped into the internal address map of the

CPU. The data and address lines are multiplexed in order to reduce the number of pins required to

connect to the external devices. The read/write timing of the bus can be adjusted to meet the timing

specification of the external devices. Note the interface only supports asynchronous 8 or 16-bit bus

interface.

HT32F1653 Datasheet(PDF) 17 Page - Holtek Semiconductor Inc

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