Renesas R8C/15 Technical Information Seite 156

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R8C/14 Group, R8C/15 Group 15. Clock Synchronous Serial I/O with Chip Select (SSU)
Rev.2.10 Jan 19, 2006 Page 142 of 253
REJ09B0164-0210
Figure 15.2 SSCRH Register
SS Control Register H
(4)
Symbol Address After Reset
SSCRH
00B8h 00h
Bit Symbol Bit Name Function RW
NOTES :
1.
2.
3.
4.
The RSSTP bit is disabled when the MSS bit is set to “0” (operates as slave device).
b7 b6 b5 b4 b3 b2 b1 b0
RW
RW
RW
(b4-b3)
Nothing is assigned. When write, set to “0”.
When read, its content is0”.
Master/Slave Device Select Bit
(2)
0 : Operates as slave device
1 : Operates as master device
RWMSS
CKS1
CKS2
Transfer Clock Rate Select Bit
(1)
b2 b1 b0
0 0 0 : f1/256
0 0 1 : f1/128
0 1 0 : f1/64
0 1 1 : f1/32
1 0 0 : f1/16
1 0 1 : f1/8
1 1 0 : f1/4
1 1 1 : Do not set
CKS0
Refer to
20.6.1 Access Registers Associated with SSU
for accessing registers associated with SSU.
The SSCK pin functions as the transfer clock output pin when the MSS bit is set to “1” (operates as master device).
The MSS bit is set to “0” (operates as slave device) w hen the CE bit in the SSSR register is set to “1” (conflict error
occurs).
RSSTP
Receive Single Stop Bit
(3)
0 : Maintains receive operation after
receiving 1-byte data
1 : Completes receive operation after
receiving 1-byte data
RW
(b7)
Nothing is assigned. When write, set to “0”.
When read, its content is0”.
The set clock is used w hen the internal clock is selected.
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