SH7730 Datasheet, PDF (508/1188 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7780 Series

Section 13 Clock Pulse Generator (CPG)
Bit
4
3
2 to 0
Initial
Bit Name Value R/W
EXOEN 0
R/W
—
All 0 R
DIV[2:0] 000
R/W
Description
EXTAL Stop
Clock supply from EXTAL stops and the on-chip crystal
oscillator also stops during the standby mode when this
bit is set to 1.
0: Does not stop the clock supply from EXTAL nor the
on-chip crystal oscillator during the standby mode
1: Stops the clock supply from EXTAL or the on-chip
crystal oscillator during the standby mode
Reserved
This bit is always read as 0. The write value should
always be 0.
Clock Select
Selects the clock for counting by the clock oscillation
settling time watch timer among 8 clocks generated by
dividing the clock from EXTAL. The overflow cycles in
parentheses are the values when the clock from
EXTAL is 15 MHz.
000: Clock from EXTAL (17 µs)
001: Clock from EXTAL/4 (68 µs)
010: Clock from EXTAL/16 (273 µs)
011: Clock from EXTAL/32 (546 µs)
100: Clock from EXTAL/64 (1.09 ms)
101: Clock from EXTAL/256 (4.36 ms)
110: Clock from EXTAL/1024 (17.48 ms)
111: Clock from EXTA /4096 (69.91 ms)
Rev. 1.00 Sep. 19, 2007 Page 460 of 1136
REJ09B0359-0100