7721 datasheet(542/577 Pages) RENESAS

542 / 577 page

APPENDIX

7721 Group User’s Manual

17–79

Appendix 10. Differences between 7721 Group and 7720 Group

Table 2 Differences between M37721S2BFP and M37720S1AFP

M37720S1AFP

512 bytes

16 MHz (maximum)

250 ns

4 bits ! 2 channels

Undefined

Exists (LDM, STA instructions

cannot be used.)

One of the following:

•When setting the receive

enable bit to “0”

•When setting the serial I/O

mode select bits to “0002”

•When reading the receive

buffer register

When all of the following are

satisfied:

•Receive enable bit = “1”

•Reception is stopped.

8 Mbytes/sec

M37721S2BFP

1024 bytes (Note)

25 MHz (maximum)

160 ns

4 bits ! 2 channels, or

6 bits ! 1channel and 2 bits ! 1channel

Retains the value before using

real-time output

Nothing (LDM, STA instructions

can be used.)

One of the following:

•When setting the receive enable

bit to “0”

•When setting the serial I/O mode

select bits to “0002”

When all of the following are

satisfied:

•Receive enable bit = “1”

•Reception is stopped.

•Dummy data is present in the

transmit buffer register

12.5 Mbytes/sec

Item

Internal RAM size

External clock input frequency

Instruction execution time (minimum)

Bit configuration of

real–time output channel

Port latch state after

using real-time output

Limitation for instruction used when writing

to interrupt control register

Timing when overrun error flag

becomes “0”

____

Conditions for outputting “L” of RTS

signal in clock synchronous serial I/O

mode

DMA shortest transfer rate

(At 1-bus cycle transfer)

Note: 512 bytes can be selected by software. For the M37721S1BFP, its internal RAM size is 512 bytes.

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