M38207E8FP Datasheet, PDF (43/66 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Reset
Middle-speed mode (f(φ) =1 MHz)
CM6
CM7=0(8MHz selected)
"1"
"0"
CM6=1(Middle-speed)
CM5=0(8MHz oscillating)
CM4=0(32kHz stopped)
High-speed mode (f(φ) =4MHz)
CM7=0(8MHz selected)
CM6=0(High-speed)
CM5=0(8MHz oscillating)
CM4=0(32kHz stopped)
CM⁴
"0"
"1" _CM⁶
"0"
"1"
"0"
"1"
"1"
"0"
Middle-speed mode (f(φ) =1 MHz)
CM7=0(8MHz selected)
CM6=1(Middle-speed)
CM5=0(8MHz oscillating)
CM4=1(32kHz oscillating)
CM6
"1"
"0"
High-speed mode (f(φ) =4MHz)
CM7=0(8MHz selected)
CM6=0(High-speed)
CM5=0(8MHz oscillating)
CM4=1(32kHz oscillating)
Low-speed mode (f( φ) =16 kHz)
CM7=1(32kHz selected)
CM6=1(Middle-speed)
CM5=0(8MHz oscillating)
CM4=1(32kHz oscillating)
CM6
"1"
"0"
Low-speed mode (f(φ) =16 kHz)
CM7=1(32kHz selected)
CM6=0(High-speed)
7
CM5=0(8MHz oscillating)
CM4=1(32kHz oscillating)
CM⁵
"0"
"1" CM⁶
"0"
"1"
Low-speed mode (f( φ) =16 kHz)
CM7=1(32kHz selected)
CM6=1(Middle-speed)
CM5=1(8MHz stopped)
CM4=1(32kHz oscillating)
CM6
"1"
"0"
"1"
"1"
"0"
Low-speed mode (f(φ) =16 kHz)
"0"
CM7=1(32kHz selected)
CM6=0(High-speed)
CM5=1(8MHz stopped)
CM4=1(32kHz oscillating)
4
CPU mode register
(CPUM : address 003B 16)
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 wati
mode is released.
3: Timer and LCD operate in the wait mode.
4: In middle-/high-speed mode, when the stop mode is released, a delay of approximately 1 ms occurs automatically by timer 1 and
timer 2.
5: In low-speed mode, when the stop mode is released, a delay of approximately 0.25 s occurs automatically by timer 1 and timer 2.
6: Wait until oscillation stabilizes after oscillating the main clock XIN 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 XIN pin and 32 kHz to the XCIN pin. φ indicates the internal clock.
Fig. 38 State transitions of internal clock φ
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