Serial Control Register (Scr) - Renesas H8S Series Hardware Manual

15.2.4

Serial Control Register (SCR)

Bit : 7
TIE
Initial value : 0
R/W : R/W
In Smart Card interface mode, the function of bits 1 and 0 of SCR changes when bit 7 of the serial mode register (SMR) is
set to 1.
Bits 7 to 2—Operate in the same way as for the normal SCI.
For details, see section 14.2.6, Serial Control Register (SCR).
Bits 1 and 0—Clock Enable 1 and 0 (CKE1, CKE0): These bits are used to select the SCI clock source and enable or
disable clock output from the SCK pin.
In Smart Card interface mode, in addition to the normal switching between clock output enabling and disabling, the clock
output can be specified as to be fixed high or low.
SCMR
SMIF
0
1
1
1
1
1
1
6 5
RIE TE
0 0
R/W R/W
SMR SCR Setting
C/A, GM CKE1
See the SCI
0 0
0 0
1 0
1 0
1 1
1 1
4 3 2
RE MPIE TEIE
0 0 0
R/W R/W R/W
CKE0 SCK Pin Function
0 Operates as port I/O pin
1 Outputs clock as SCK output pin
0 Operates as SCK output pin, with output fixed
low
1 Outputs clock as SCK output pin
0 Operates as SCK output pin, with output fixed
high
1 Outputs clock as SCK output pin
1 0
CKE1 CKE0
0 0
R/W R/W
Rev.6.00 Oct.28.2004 page 523 of 1016
REJ09B0138-0600H