HD64F2168 Datasheet, PDF (402/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Bit Bit Name
1
CKE1
0
CKE0
[Legend]
*:
Don’t care
Initial Value
0
0
R/W Description
R/W Clock Enable 1 and 0
R/W _{These bits select the clock source and SCK pin}
function.
Asynchronous mode:
00: Internal clock
(SCK pin functions as I/O port.)
01: Internal clock
(Outputs a clock of the same frequency as the bit
rate from the SCK pin.)
1*: External clock
(Inputs a clock with a frequency 16 times the bit
rate from the SCK pin.)
Clock synchronous mode:
0*: Internal clock (SCK pin functions as clock output.)
1*: External clock (SCK pin functions as clock input.)
Rev. 3.00, 03/04, page 362 of 830