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Receive Operation Using the Wait Function:
Figures 13.13 and 13.14 show the sample flowcharts for the operations in master receive mode
(WAIT = 1).
Figure 13.13 Sample Flowchart for Operations in Master Receive Mode
Master receive mode
Set TRS = 0 in ICCR
Set ACKB = 0 in ICSR
Set HNDS = 0 in ICXR
Clear IRIC flag in ICCR
Set WAIT = 1 in ICMR
Read ICDR
Read IRIC flag in ICCR
No
IRIC = 1?
Yes
No
IRTR = 1?
Yes
Is next
Yes
receive the last one?
Last receive?
No
Read ICDR
Clear IRIC flag in ICCR
Set ACKB = 1 in ICSR
Wait for one clock pulse
Set TRS = 1 in ICCR
Read ICDR
Clear IRIC flag in ICCR
Read IRIC flag in ICCR
No
IRIC=1?
Yes
Yes
IRTR=1?
No
Clear IRIC flag in ICCR
Set WAIT = 0 in ICMR
Clear IRIC flag in ICCR
Read ICDR
Set BBSY= 0 and SCP= 0
in ICCR
End
(receiving multiple bytes) (WAIT = 1)
[1] Select receive mode.
[2] Start receiving. The first read
is a dummy read.
[3] Wait for a receive wait
(Set IRIC at the fall of the 8th clock) or,
Wait for 1 byte to be received
(Set IRIC at the rise of the 9th clock)
[4] Determine end of reception
[5] Read the receive data.
[6] Clear IRIC flag.
(to end the wait insertion)
[7] Set acknowledge data for the last reception.
[8] Wait for TRS setting
[9] Set TRS for stop condition issuance
[10] Read the receive data.
[11] Clear IRIC flag. (to end the wait insertion)
[12] Wait for a receive wait
(Set IRIC at the fall of the 8th clock) or,
Wait for 1 byte to be received
(Set IRIC at the rise of the 9th clock)
[13] Determine end of reception
[14] Clear IRIC.
(to end the wait insertion)
[15] Clear wait mode.
Clear IRIC flag.
( IRIC flag should be cleared to 0
after setting WAIT = 0.)
[16] Read the last receive data.
[17] Generate stop condition
Rev. 1.00, 05/04, page 317 of 544
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