r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 658

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 15 Synchronous Serial Communication Unit (SSU)
15.4.7
In clock synchronous communication mode, data communications are performed via three lines:
clock line (SSCK), data input line (SSI), and data output line (SSO).
(1)
Figure 15.12 shows an example of the initial settings in clock synchronous communication mode.
Before data transfer, clear both the TE and RE bits in SSER to 0 to set the initial values.
Note: Before changing operating modes and communications formats, clear both the TE and RE
Rev. 1.00 Sep. 21, 2007 Page 632 of 1124
REJ09B0402-0100
[5]
Figure 15.12 Example of Initial Settings in Clock Synchronous Communication Mode
[6]
[1]
[2]
[3]
[4]
Initial Settings in Clock Synchronous Communication Mode
bits to 0. Although clearing the TE bit to 0 sets the TDRE bit to 1, clearing the RE bit to 0
does not change the values of the RDRF and ORER bits and SSRDR. Those bits retain the
previous values.
Set PFC for external pins to be used
Specify bits TE, RE, TEIE, TIE, RIE,
Clock Synchronous Communication Mode
Clear TE and RE bits in SSER to 0
Specify bits TENDSTS, SCSATS,
and CEIE in SSER simultaneously
Specify CPOS, CKS2, CKS1, and
Set SSUMS in SSCRL to 1 and
specify bits DATS1 and DATS0
(SSCK, SSI, SSO, and SCS)
Start setting initial values
and SSODTS in SSCR2
Specify MSS in SSCRH
CKS0 bits in SSMR
End
[1] Make appropriate settings in the PFC for the external
[2] Specify master/slave mode selection and SSCK pin
[3] Selects clock synchronous communication mode and
[4] Specify clock polarity selection and transfer clock rate
[5] Specify timing of TEND bit setting, SCS pin assertion, and data
[6] Enables/disables interrupt requests to the CPU.
pins to be used.
selection.
specify transmit/receive data length.
selection.
output on the SSO pin.