M38258MCM Datasheet, PDF (41/70 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3825 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Reset
Middle-speed mode (f(φ) =1 MHz)
CM6
CM7=0(8 MHz selected)
“1”
“0”
CM6=1(Middle-speed)
CM5=0(8 MHz oscillating)
CM4=0(32 kHz stopped)
High-speed mode (f(φ) =4 MHz)
CM7=0(8 MHz selected)
CM6=0(High-speed)
CM5=0(8 MHz oscillating)
CM4=0(32 kHz stopped)
“0”
C“M1”⁴ _CM6
“0”
“1”
“1”
C“M0”
6
CM
4
“1”
“0”
Middle-speed mode (f(φ) =1 MHz)
CM6
CM7=0(8 MHz selected)
“1”
“0”
CM6=1(Middle-speed)
CM5=0(8 MHz oscillating)
CM4=1(32 kHz oscillating)
High-speed mode (f(φ) =4 MHz)
CM7=0(8 MHz selected)
CM6=0(High-speed)
CM5=0(8 MHz oscillating)
CM4=1(32 kHz oscillating)
Low-speed mode (f(φ) =16 kHz)
CM7=1(32 kHz selected)
CM6=1(Middle-speed)
CM5=0(8 MHz oscillating)
CM4=1(32 kHz oscillating)
CM6
“1”
“0”
C“M1”⁵ _CM6
“0”
“1”
Low-speed mode (f(φ) =16 kHz)
CM7=1(32 kHz selected)
CM6=1(Middle-speed)
CM5=1(8 MHz stopped)
CM4=1(32 kHz oscillating)
CM6
“1”
Low-speed mode (f(φ) =16 kHz)
“0”
CM7=1(32 kHz selected)
CM6=0(High-speed)
b7
CM5=0(8 MHz oscillating)
CM4=1(32 kHz oscillating)
“1”
CM“0”
6
CM
5
“1”
“0”
Low-speed mode (f(φ) =16 kHz)
“0”
CM7=1(32 kHz selected)
CM6=0(High-speed)
CM5=1(8 MHz stopped)
CM4=1(32 kHz oscillating)
b4
CPU mode register
(CPUM : address 003B16)
CM4 : Port Xc switch bit
0: I/O port
1: XCIN, XCOUT
CM5 : Main clock (XIN–XOUT) stop bit
0: Oscillating
1: Stopped
CM6 : Main clock division ratio selection bit
0: f(XIN)/2 (high-speed mode)
1: f(XIN)/8 (middle-speed mode)
CM7 : Internal system clock selection bit
0: XIN–XOUT selected
(middle-/high-speed mode)
1: XCIN–XCOUT selected
(low-speed mode)
Notes 1 : Switch the mode by the allows shown between the mode blocks. (Do not switch between the mode directly without an allow.)
2 : The all modes can be switched to the stop mode or the wait mode and returned to the source mode when the stop mode or the wait
mode is ended.
3 : Timer and LCD operate in the wait mode.
4 : When the stop mode is ended, a delay of approximately 1 ms occurs automatically by timer 1 and timer 2 in middle-/high-speed mode.
5 : When the stop mode is ended, a delay of approximately 0.25 s occurs automatically by timer 1 and timer 2 in low-speed mode.
6 : Wait until oscillation stabilizes after oscillating the main clock X IN before the switching from the low-speed mode to middle-/high-
speed mode.
7 : The example assumes that 8 MHz is being applied to the X IN pin and 32 kHz to the XCIN pin. φ indicates the internal clock.
Fig. 42 State transitions of internal clock φ
41