Rev. 3.0, 10/02, page 410 of 686
13.9.3
Receive Error Flags and Transmit Operations (Clocked Synchronous Mode Only)
Transmission cannot be started when a receive error flag (ORER, PER, or FER) is set to 1, even if
the TDRE flag is cleared to 0. Be sure to clear the receive error flags to 0 before starting
transmission. Note also that receive error flags cannot be cleared to 0 even if the RE bit is cleared
to 0.
13.9.4
Restrictions on Use of DMAC or DTC
•
When an external clock source is used as the serial clock, the transmit clock should not be
input until at least 5 ø clock cycles after TDR is updated by the DMAC or DTC. Misoperation
may occur if the transmit clock is input within 4 ø clocks after TDR is updated. (Figure 13.26)
•
When RDR is read by the DMAC or DTC, be sure to set the activation source to the relevant
SCI reception end interrupt (RXI).
t
D0
LSB
Serial data
SCK
D1
D3
D4
D5
D2
D6
D7
Note: When operating on an external clock, set t >4 clocks.
TDRE
Figure 13.26 Example of Clocked Synchronous Transmission by DTC
13.9.5
Operation in Case of Mode Transition
•
Transmission
Operation should be stopped (by clearing TE, TIE, and TEIE to 0) before making a module
stop mode, software standby mode, or subsleep mode transition. TSR, TDR, and SSR are reset.
The output pin states in module stop mode, software standby mode, or subsleep mode depend
on the port settings, and becomes high-level output after the relevant mode is cleared. If a
transition is made during transmission, the data being transmitted will be undefined. When
transmitting without changing the transmit mode after the relevant mode is cleared,
transmission can be started by setting TE to 1 again, and performing the following sequence:
SSR read -> TDR write -> TDRE clearance. To transmit with a different transmit mode after
clearing the relevant mode, the procedure must be started again from initialization. Figure
13.27 shows a sample flowchart for mode transition during transmission. Port pin states are
shown in figures 13.28 and 13.29.
Содержание H8S/2215 Series
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Страница 481: ...Rev 3 0 10 02 page 423 of 686 I O pin Control OUT IN TDI pin TDO pin Figure 14 2 Boundary Scan Register Configuration ...
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Страница 721: ...Rev 3 0 10 02 page 663 of 686 ø A23 to A0 to tBRQS tBACD tBZD tBACD tBZD tBRQS Figure 24 11 External Bus Release Timing ...
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