M37160M8 Datasheet, PDF (89/131 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

M37160M8/MA/MF-XXXSP/FP,M37160EFSP/FP
1. When Reference Clock from FSCIN is Used
Clock Control Register 2 (address 021116) bit 2 = "0"
Reset
High-speed operation start
mode
FSCIN=4.43MHz
f(XIN)=8.86MHz
φ is stopped (“H”)
Timer operating
WIT instruction
Interrupt
External INT,
timer INT,
or SI/O INT
FSCIN=4.43MHz
f(XIN)=8.86MHz
f(φ)=f(XIN)/2
STP instruction
External INT
CM7=0
CM7=1
FSCIN=stopped
f(XIN)=stopped
φ is stopped (“H”)
FSCIN=4.43MHz
f(XIN)=8.86MHz
f(XCIN)=4.43MHz
f(φ)=f(XCIN)/2
CC10 : clock control register1 (address 00CD16) bit 0
CM6=1
CC10=1
CM6=0
CC10=0
The program must
allow time for 8.86 MHz
oscillation to stabilize
FSCIN=4.43MHz
f(XIN)=stopped
f(XCIN)=4.43MHz
φ is stopped (“H”)
Timer operating
WIT instruction
Interrupt
FSCIN=4.43MHz
f(XIN)=stopped
f(XCIN)=4.43MHz
f(φ)=f(XCIN)/2
STP instruction
External INT
FSCIN=stopped
f(XIN)=stopped
f(XCIN)=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-XCOUTselected or FSCIN input
(low-speed mode)
The above example assumes that the FSCIN pin has 4.43 MHz applied to it. The φ indicates the internal clock.
Fig.8.13.8 State Transitions of System Clock (1)
Rev.1.01 2003.11.13 page 89 of 130