h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 525
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h8s-2646
Manufacturer Part Number
h8s-2646
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2646.pdf
(1165 pages)
- Current page: 525 of 1165
- Download datasheet (6Mb)
Restrictions on Use of DTC
• When an external clock source is used as the serial clock, the transmit clock should not be
• When RDR is read by the DTC, be sure to set the activation source to the relevant SCI
Operation in Case of Mode Transition
• Transmission
input until at least 5 φ clock cycles after TDR is updated by the DTC. Misoperation may occur
if the transmit clock is input within 4 φ clocks after TDR is updated. (Figure 13.22)
reception end interrupt (RXI).
Operation should be stopped (by clearing TE, TIE, and TEIE to 0) before making a module
stop mode, software standby mode, watch mode, subactive mode, or subsleep mode transition.
TSR, TDR, and SSR are reset. The output pin states in module stop mode, software standby
mode, watch mode, subactive 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 13.23 shows a sample flowchart
for mode transition during transmission. Port pin states are shown in figures 13.24 and 13.25.
Operation should also be stopped (by clearing TE, TIE, and TEIE to 0) before making a
transition from transmission by DTC transfer to module stop mode, software standby mode,
watch mode, subacti\ve mode, or subsleep mode transition. To perform transmission with the
DTC after the relevant mode is cleared, setting TE and TIE to 1 will set the TXI flag and start
DTC transmission.
SCK
TDRE
Serial data
Note: When operating on an external clock, set t >4 clocks.
Figure 13.22 Example of Clocked Synchronous Transmission by DTC
t
LSB
D0
D1
D2
Section 13 Serial Communication Interface (SCI)
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Rev. 5.00 Sep 22, 2005 page 499 of 1136
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REJ09B0257-0500
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