Datasheet

Section 16 Serial Communication Interface (SCI, IrDA)
(The H8S/2695 is not equipped with an IrDA function)
Page 736 of 1434 R01UH0166EJ0600 Rev. 6.00
Mar 02, 2011
H8S/2633 Group, H8S/2633 F-ZTAT
TM
,
H8S/2633R F-ZTAT
TM
, H8S/2695
Bits 1 and 0—Clock Select 1 and 0 (CKS1, CKS0): These bits select the clock source for the
baud rate generator. The clock source can be selected from φ, φ/4, φ/16, and φ/64, according to the
setting of bits CKS1 and CKS0.
For the relation between the clock source, the bit rate register setting, and the baud rate, see
section 16.2.8, Bit Rate Register (BRR).
Bit 1 Bit 0
CKS1 CKS0 Description
0 0 φ clock (Initial value)
1 φ/4 clock
1 0 φ/16 clock
1 φ/64 clock
16.2.6 Serial Control Register (SCR)
7
TIE
0
R/W
6
RIE
0
R/W
5
TE
0
R/W
4
RE
0
R/W
3
MPIE
0
R/W
0
CKE0
0
R/W
2
TEIE
0
R/W
1
CKE1
0
R/W
Bit
Initial value
R/W
:
:
:
SCR is a register that performs enabling or disabling of SCI transfer operations, serial clock output
in asynchronous mode, and interrupt requests, and selection of the serial clock source.
SCR can be read or written to by the CPU at all times.
SCR is initialized to H'00 by a reset and in standby mode.
Bit 7—Transmit Interrupt Enable (TIE): Enables or disables transmit data empty interrupt
(TXI) request generation when serial transmit data is transferred from TDR to TSR and the TDRE
flag in SSR is set to 1.
Bit 7
TIE Description
0 Transmit data empty interrupt (TXI) requests disabled (Initial value)
1 Transmit data empty interrupt (TXI) requests enabled
Note: TXI interrupt request cancellation can be performed by reading 1 from the TDRE flag, then
clearing it to 0, or clearing the TIE bit to 0.