524
Bits 1 and 0—Clock Select 1 and 0 (CKS1, CKS0): Select the internal clock source of the on-
chip baud rate generator. According to the setting of the CKS1 and CKS0 bits four clock sources
are available. P
φ
, P
φ
/4, P
φ
/16 and P
φ
/64. For further information on the clock source, bit rate
register settings, and baud rate, see section 16.2.8, Bit Rate Register (SCBRR).
Bit 1: CKS1
Bit 0: CKS0
Description
0
0
P
φ
(Initial
value)
1
P
φ
/4
1
0
P
φ
/16
1
P
φ
/64
Note:
P
φ
: Peripheral clock
16.2.6
Serial Control Register (SCSCR)
The serial control register (SCSCR) operates the SCIF transmitter/receiver, selects the serial clock
output in asynchronous mode, enables/disables interrupt requests, and selects the transmit/receive
clock source. The CPU can always read and write to SCSCR. SCSCR is initialized to H'00 by a
reset and in standby or module standby mode.
Bit:
7
6
5
4
3
2
1
0
TIE
RIE
TE
RE
—
—
CKE1
CKE0
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R
R
R/W
R/W
Bit 7—Transmit Interrupt Enable (TIE): Enables or disables the transmit-FIFO-data-empty
interrupt (TXI) requested when the serial transmit data is transferred from the transmit FIFO data
register (SCFTDR) to the transmit shift register (SCTSR), when the quantity of data in the
transmit FIFO register becomes less than the specified number of transmission triggers, and when
the TDFE flag in the serial FIFO status register (SCFSR) is set to1.
Bit 7: TIE
Description
0
Transmit-FIFO-data-empty interrupt request (TXI) is disabled
*
(Initial value)
1
Transmit-FIFO-data-empty interrupt request (TXI) is enabled
Note:
*
The TXI interrupt request can be cleared by writing a greater quantity of transmit data than
the specified transmission trigger number to SCFTDR and by clearing TDFE to 0 after
reading 1 from TDFE, or can be cleared by clearing TIE to 0.
Содержание SH7709S
Страница 2: ...Hitachi SuperH RISC engine SH7709S Hardware Manual ADE 602 250 Rev 1 0 09 21 01 Hitachi Ltd ...
Страница 75: ...56 ...
Страница 107: ...88 ...
Страница 125: ...106 ...
Страница 139: ...120 ...
Страница 203: ...184 ...
Страница 245: ...226 ...
Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
Страница 323: ...304 Tp TRr TRrw TRrw CKIO CKE CSn RAS3U RAS3L CASU CASL RD WR Figure 10 28 Synchronous DRAM Auto Refresh Timing ...
Страница 411: ...392 ...
Страница 609: ...590 ...
Страница 635: ...616 ...
Страница 663: ...644 ...
Страница 679: ...660 ...