HD64F2145 Datasheet, PDF (386/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Bit
Bit Name
1
CKE1
0
CKE0
Legend
X: Don’t care
Initial Value R/W
0
R/W
0
R/W
Description
Clock Enable 1, 0
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.)
1X: External clock
(Inputs a clock with a frequency 16 times the bit rate
from the SCK pin.)
Clocked synchronous mode
0X: Internal clock (SCK pin functions as clock
output.)
1X: External clock (SCK pin functions as clock
input.)
Rev. 2.0, 08/02, page 346 of 788