HD6473847RHV Datasheet, PDF (375/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 13 LCD Controller/Driver
Table 13.6 Power-Down Modes and Display Operation
Mode
Reset Active Sleep Watch
Module
Subactive Subsleep Standby Standby
Clock φ
Runs Runs
Runs
Stops
Stops
Stops
Stops Stops^*4
φ_w
Runs
Display ACT = 0 Stops
operation _{ACT = 1 Stops}
Runs
Runs
Runs
Runs
Runs
Stops^*1
Stops Stops Stops
Stops
Stops
Stops^*2
Functions Functions Functions^*3 Functions^*3 Functions^*3 Stops^*2
Stops^*4
Stops
Stops
Notes: 1. The subclock oscillator does not stop, but clock supply is halted.
2. The LCD drive power supply is turned off regardless of the setting of the PSW bit.
3. Display operation is performed only if φ , φ /2, or φ /4 is selected as the operating
WW
W
clock.
4. The clock supplied to the LCD stops.
13.4.4 Boosting LCD Drive Power Supply
When the on-chip power supply capacity is insufficient for the LCD panel drivability, the power-
supply impedance must be reduced. This can be done by connecting bypass capacitors of around
0.1 to 0.3 µF to pins V1 to V3, as shown in figure 13.9, or by adding a split-resistor externally.
V_CC
R
This LSI
V1
R
R = several kΩ to
several MΩ
V2
R
V3
R
V_SS
C = 0.1 to 0.3 μF
Figure 13.9 Connection of External Split-Resistance
Rev. 7.00 Mar. 08, 2010 Page 343 of 510
REJ09B0024-0700