M37150M6 Datasheet, PDF (99/141 Pages) Renesas Technology Corp – SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER

M37150M6/M8/MA/MC/MF-XXXFP, M37150EFFP
2. When using the 32 kHz oscillating
Clock Control Register 2 (address 021116) bit 2 = "1"
Reset
High-speed operation start
mode
FSCIN=3.58MHz
f(XIN)=8.95MHz
32kHz oscillating
φ is stopped (“H”)
Timer operating
WIT instruction
Interrupt
External INT,
timer INT,
or SI/O INT
FSCIN=3.58MHz
f(XIN)=8.95MHz
32kHz oscillating
f(φ)=f(XIN)/2
STP instruction
External INT
CM7=0
CM7=1
FSCIN=stopped
f(XIN)=stopped
32kHz stopped
φ is stopped (“H”)
FSCIN=3.58MHz
f(XIN)=8.95MHz
32kHz oscillating
f(φ)=16MHz
CM6=1
CC10=1
CM6=0
CC10=0
The program must
allow time for 8.95 MHz
oscillation to stabilize
FSCIN=3.58MHz
f(XIN)=stopped
32kHz oscillating
φ is stopped (“H”)
Timer operating
WIT instruction
Interrupt
FSCIN=3.58MHz
f(XIN)=stopped
32kHz oscillating
f(φ)=16MHz
STP instruction
External INT
FSCIN=stopped
f(XIN)=stopped
32kHz stopped
φ is stopped (“H”)
CPU mode register
(Address 00FB16)
CM6: Main clock f(XIN) stop bit
0: oscillating
1: stopped
CM7: Internal system clock selection bit
0: f(XIN) selected (high-speed mode)
1: XCIN-XCOUT selected or FSCIN input
(low-speed mode)
The above example assumes that the FSCIN and XCIN pins have 3.58 MHz and 32 kHz signals applied, respectively.
The φ indicates the internal clock.
Fig.8.14.9 State Transitions of System Clock (2)
Rev.1.00 Nov 01, 2002 page 99 of 139
REJ03B0128-0100Z