CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U19014EJ1V0UD
107
5.6.6 CPU clock status transition diagram
Figure 5-14 shows the CPU clock status transition diagram of this product.
Figure 5-14. CPU Clock Status Transition Diagram
When 2.7 V/1.59 V POC Mode Is Set (Option Byte: POCMODE = 1)
Power ON
Reset release
CPU: Operating
with internal high-
speed oscillation
CPU: Operating
with X1 oscillation or
EXCLK input
(B)
(A)
(C)
CPU: X1
oscillation/EXCLK
input
→
STOP
(E)
V
DD
≥
2.7 V (MIN.)
V
DD
≥
1.8 V (MIN.)
V
DD
< 2.7 V (MIN.)
CPU: X1
oscillation/EXCLK
input
→
HALT
(D)
Regulator: Operating in normal mode
Internal low-speed oscillator: Operable
Internal high-speed oscillator: Operable
X1 oscillation/EXCLK input: Operating
Regulator: Operating in normal mode
Internal low-speed oscillator: Operable
Internal high-speed oscillator:
Selectable by CPU
X1 oscillation/EXCLK input: Operating
Regulator: Operating in normal mode
Internal low-speed oscillator: Operable
Internal high-speed oscillator: Operating
X1 oscillation/EXCLK input:
Selectable by CPU
Regulator: Woken up
Internal low-speed oscillator: Woken up
Internal high-speed oscillator: Woken up
X1 oscillation/EXCLK input: Stops (I/O port mode)
Regulator: Operating in normal mode
Internal low-speed oscillator: Operating
Internal high-speed oscillator: Operating
X1 oscillation/EXCLK input: Stops (I/O port mode)
Regulator: Operating in low
operating current mode
Internal low-speed oscillator: Operable
Internal high-speed oscillator: Stops
X1 oscillation/EXCLK input: Stops
Remark
In the 2.7 V/1.59 V POC mode (option byte: POCMODE = 1), the CPU clock status changes to (A) in the
above figure when the supply voltage exceeds 2.7 V (TYP.), and to (B) after reset processing (20
µ
s
(TYP.)).
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