HD404829R Datasheet, PDF (38/149 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a LCD controller/Driver Circuit

HD404829R Series
Direct Transition from Subactive Mode to Active Mode: Available by controlling the direct transfer on
flag (DTON: $020, bit 3) and the low speed on flag (LSON: $020, bit 0). The procedures are described
below:
• Set LSON to 0 and DTON to 1 in subactive mode.
• Execute the STOP or SBY instruction.
• The MCU automatically enters active mode from subactive mode after waiting for the MCU internal
processing time and oscillation stabilization time (figure 19).
Notes: 1. The DTON flag can be set only in subactive mode. It is always reset in active mode.
2. The transition time (T_D) from subactive mode to active mode:
t_RC < T_D < T + t_RC
Miscellaneous register (MIS: $00C)
Bit
Initial value
Read/Write
Bit name
3
0
W
MIS3
2
0
W
MIS2
1
0
W
MIS1
0
0
W
MIS0
MIS3 MIS2
Buffer control.
Refer to figure 41.
MIS1
0
0
1
1
MIS0
0
1
0
1
T^*1
t_RC^{* 1} Oscillation circuit conditions
0.24414 ms 0.12207 ms External clock input
0.24414 ms^{* 2}
15.625 ms 7.8125 ms Ceramic oscillator
62.5 ms 31.25 ms
Crystal oscillator
Not used Not used
—
Notes: 1. Values of T and t_RC when a 32.768-kHz crystal oscillator is used to pins ×1 and ×2.
2. The value is applied only when direct transfer operation is used.
Figure 18 Miscellaneous Register (MIS)
STOP/SBY instruction execution
Subactive mode
MCU internal
processing time
(Set LSON = 0, DTON = 1)
Oscillation
stabilization
time
Interrupt strobe
Direct transfer
completion timing
T
t _RC
T_D
T: Interrupt frame length
t _RC : Oscillation stabilization period
T_D : Direct transition time
Active mode
Figure 19 Direct Transition Timing
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