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Section 10 Serial Communication Interface
Rev. 6.00 Sep 12, 2006 page 300 of 526
REJ09B0326-0600
Serial Status Register (SSR)
Bit
7 6 5 4 3 2 1 0
TDRE
RDRF
OER
FER
PER
TEND
MPBR
MPBT
Initial
value 1 0 0 0 0 1 0 0
Read/Write R/(W)
*
R/(W)
*
R/(W)
*
R/(W)
*
R/(W)
*
R
R R/W
Note:
*
Only a write of 0 for flag clearing is possible.
SSR is an 8-bit register containing status flags that indicate the operational status of SCI3, and
multiprocessor bits.
SSR can be read or written by the CPU at any time, but only a write of 1 is possible to bits TDRE,
RDRF, OER, PER, and FER. In order to clear these bits by writing 0, 1 must first be read.
Bits TEND and MPBR are read-only bits, and cannot be modified.
SSR is initialized to H'84 upon reset, and in standby, watch, subactive, or subsleep mode.
Bit 7
Transmit Data Register Empty (TDRE):
Bit 7 indicates that transmit data has been
transferred from TDR to TSR.
Bit 7: TDRE
Description
0
Transmit data written in TDR has not been transferred to TSR
Clearing conditions:
•
After reading TDRE = 1, cleared by writing 0 to TDRE
•
When data is written to TDR by an instruction
1
Transmit data has not been written to TDR, or transmit data written in TDR has
been transferred to TSR
Setting conditions:
•
When bit TE in SCR3 is cleared to 0
•
When data is transferred from TDR to TSR
(initial value)
Summary of Contents for F-ZTAT H8/3642A Series
Page 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Page 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Page 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...