h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 475

• Manufacturer Part Number: h8s-2628
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

16.4
16.4.1
A transfer clock can be selected from eight internal clocks and an external clock. When using this
module, set SCKS in SSCRH to 1 to select the SSCK pin as a serial clock. When MSS in SSCRH
is 1, an internal clock is selected and the SSCK pin is used as an output pin. When transfer is
started, the clock with the transfer rate set by bits CKS2 to CKS0 in SSMR is output from the
SSCK pin. When MSS 0, an external clock is selected and the SSCK pin is used as an input pin.
16.4.2
The relationship of clock phase, polarity, and transfer data depends on the combination of CPOS
and CPHS in SSMR. Figure 16.2 shows the relationship.
Setting the MLS bit specifies that MSB or LSB first communication. When MLS 0, data is
transferred from the LSB to MSB. When MLS 1, data is transferred from the MSB to LSB.
(1) When CPHS = 0
(2) When CPHS = 1
(CPOS = 0)
(CPOS = 1)
(CPOS = 0)
(CPOS = 1)
SSI, SSO
SSI, SSO
Operation
Transfer Clock
Relationship of Clock Phase, Polarity, and Data
SSCK
SSCK
SSCK
SSCK
SCS
SCS
Figure 16.2 Relationship of Clock Phase, Polarity, and Data
Bit 0
Bit 0
Section 16 Synchronous Serial Communication Unit (SSU)
Bit 1
Bit 1
Bit 2
Bit 2
Bit 3
Bit 3
Rev. 3.00 Oct 04, 2005 page 435 of 598
Bit 4
Bit 4
Bit 5
Bit 5
Bit 6
Bit 6
Bit 7
REJ09B0155-0300
Bit 7