Serial Control Register (Scr) - Hitachi H8S/2646 Hardware Manual

14.2.4

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 13.2.6, 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 SMR
SMIF C/A, GM
0 See the SCI
1 0
1 0
1 1
1 1
1 1
1 1
6 5
RIE TE
0 0
R/W R/W
SCR Setting
CKE1 CKE0
0 0
0 1
0 0
0 1
1 0
1 1
4 3
RE MPIE TEIE
0 0
R/W R/W R/W
SCK Pin Function
Operates as port I/O pin
Outputs clock as SCK output pin
Operates as SCK output pin, with output fixed
low
Outputs clock as SCK output pin
Operates as SCK output pin, with output fixed
high
Outputs clock as SCK output pin
2 1 0
CKE1 CKE0
0 0 0
R/W R/W
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