Section 19 LPC Interface (LPC)
Rev. 1.00 Mar. 12, 2008 Page 738 of 1178
REJ09B0403-0100
19.4.4
BT Mode Transfer Flow
Figure 19.6 shows the write transfer flow and figure 19.7 shows the read transfer flow in BT
mode.
Wait for
B_BUSY = 0
Wait for
H2B_ATN = 0
Host confirms the B_BUSY bit in BTCR.
Host confirms the H2B_ATN bit in BTCR.
Host clears write pointer by setting the CLR_WR_PTR
bit in BTCR.
Host writes data of 1 to n bytes to the BTDTR buffer.
Confirms host write is started.
The HBTWI bit in BTSR0 is set.
Host sets the H2B_ATN bit in BTCR to indicate data write
completion to the buffer for the BT interface.
Clear write pointer
B_BUSY = 1
Generate slave
interrupt
Generate slave
interrupt
Generate slave
interrupt
Slave waits for the H2B_ATN bit (interrupt from
host) is set.
Slave reads data from the BTDTR buffer.
Slave clears the H2B_ATN bit in BTCR.
Confirms the CLR_WR_PTR bit.
The CRWPI bit in BTSR1 is set to notify write
pointer clearing as an interrupt to slave.
Confirms the H2B_ATN bit is set.
The H2BI bit in BTSR1 is set.
Slave sets the B_BUSY bit in BTCR.
Write BTDTR buffer
Read BTDTR buffer
H2B_ATN = 1
H2B_ATN = 0
B_BUSY = 0
Slave clears the B_BUSY bit in BTCR to indicate
transfer completion.
Host
Slave
Figure 19.6 BT Write Transfer Flow
Содержание H8S Family
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