Renesas R8C/15 Informações Técnicas Página 160

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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 146 of 253
REJ09B0164-0210
Figure 15.6 SSSR Register
SS Status Register
(7)
Symbol Address After Reset
SSSR
00BCh 00h
Bit Symbol Bit Name Function RW
NOTES :
1.
2.
3.
4.
5.
6.
7.
fromL” to “H during transfer, the CE bit is set to “1”.
Indicates overrun error occurs and receive completes by error when receive. When the next serial data receive is
completed while the RDRF bit is set to “1” (data in the SSRDR register), the ORER bit is set to “1”. After the ORER bit
is set to “1” (overrun error occurs), do not transmit or receive while the ORER bit is set to “1”.
When the serial communication is started w hile the SSUMS bit in the SSMR2 register is set to “1” (four-wire
bus communication mode) and the MSS bit in the SSCRH register is set to “1” (operates as master
device), the CE bit is set to “1” ifL” is applied to the SCS
_
___
_
pin input. When the SSUMS bit in the SSMR2
(operates as slave device) is set to “0” (operates as slave device) and the SCS
_
____
pin input changes the level
register is set to “1” (four-w ire bus communication mode), the MSS bit in the SSCRH register is set to “0”
Refer to
20.6.1 Access Registers Associated with SSU
for accessing registers associated with SSU.
The TEND and TDRE bits are set to “0” when writing the data to the SSTDR register.
Overrun Error Flag
(1)
0 : No overrun error occurs
1 : Overrun error occurs
(3)
The TDRE bit is set to “1” when setting the TE bit in the SSER register to “0” (disables transmit).
TEND
Transmit End
(1, 5)
0 : The TDRE bit is set to “0” when transmitting
the end of the bit in transmit data
1 : The TDRE bit is set to “1” when transmitting
the end of the bit in transmit data
RW
RW
ORER
(b4-b3)
CE RW
RW
Conflict Error Flag
(1)
0 : No conflict error occurs
1 : Conflict error occurs
(2)
RDRF
Receive Data Register Full
(1, 4)
(b1)
Nothing is assigned. When write, set to “0”.
When read, its content is0”.
0 : No data in SSRDR register
1 : Data in SSRDR register
b3 b2 b1b7 b6 b5 b4 b0
When reading “1” and writing “0”, the CE, ORER, RDRF, TEND and TDRE bits are set to “0”.
The RDRF bit is set to “0” when reading out the data from the SSRDR register.
Nothing is assigned. When write, set to “0”.
When read, its content is0”.
TDRE
Transmit Data Empty
(1, 5, 6)
0 : Data is not transferred from the SSTDR
to SSTRSR registers
1 : Data is transferred from the SSTDR to
SSTRSR registers
RW
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