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RPC3G-914-64

更新时间： 2022-02-26 12:22:35

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RPC3G-914-64 数据手册

2.1.2 WRITE A BYTE TO RPC3G

The sequence for a byte transfer from the Host to the RPC3G (i.e. TX download) is asynchronous and

proceeds as follows:

1. HOST asserts TX Request line low to initiate transfer

2. Wait for RPC3G to pull TX Accept low (i.e. request is accepted)

3. Set data lines to output and place LS nibble on the data lines

4. Negate TX Request (set to 1) to tell RPC3G that data is present.

5. Wait for RPC3G to negate TX Accept (i.e. data has been accepted)

Repeat steps 1-5 with MS nibble.

figure 7: TX download timing diagram

Notes:

 The data bus must not be set to output until step 3. i.e. after the RPC3G has accepted the request. The

bus may be left as an output until the entire packet has been transferred to the RPC3G, it should then be

set back to input (default state).

 The RPC3G's normal response time to the initial TX Request may be up to 1ms, thereafter, for the

duration of the packet, the response will be fast.

 The RPC3G will ignore a TX Request from the Host while it is receiving a packet from the radio. If the

incoming packet fails it's error check the RPC3G will respond to the TX Request as normal, i.e. the TX

Accept from the RPC3G will be delayed until the incoming packet has finished. If a valid packet is

received this must be uploaded to the Host before the RPC3G can respond to the Host’s TX Request.

Thus an RX Request will be signalled to the Host and not the expected TX Accept and the Host must

upload the incoming packet before the TX packet can be downloaded. The TX Request should be left

asserted (low) during the upload. The RPC3G will respond as normal after the upload is completed.

 For the above reason it is often easier to use RX Request to trigger a HOST interrupt and upload the

RPC3G to the HOST under interrupt control.

 See Appendix B and C. for example RPC3G driver subroutines.

Radiometrix Ltd, RPC3G

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