h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 564

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 17 LCD Controller/Driver
Table 17.6 Power-Down Modes and Display Operation
Notes: 1. The subclock oscillator does not stop, but clock supply is halted.
17.4.4
When a large panel is driven, the on-chip power supply capacity may be insufficient. In this case,
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 17.9, or by adding a split-resistance
externally.
Rev. 2.00 Dec. 05, 2005 Page 526 of 724
REJ09B0200-0200
Mode
Clock
Display
operation
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
4. The clock supplied to the LCD stops.
φ
φ
ACT = 0 Stops
ACT = 1 Stops
SUB
Boosting the LCD Drive Power Supply
clock.
This LSI
Reset
Runs
Runs
V
V
CC
SS
Figure 17.9 Connection of External Split-Resistance
Active
Runs
Runs
Stops
Functions Functions Functions*
V1
V2
V3
Sleep
Runs
Runs
Stops
VR
Watch
Stops
Runs
Stops
R
R
R
SUB
3
Subactive
Stops
Runs
Stops
Functions*
, φ
R =
SUB
several kΩ to
several MΩ
/2, or φ
3
Subsleep
Stops
Runs
Stops
Functions*
SUB
/4 is selected as the operating
3
Software
Standby
Stops
Stops*
Stops*
Stops*
C = 0.1 to 0.3 µF
1
2
2
Hardware
standby
Stops
Stops
Stops*
Stops*
2
2
Module
Stop
Stops*
Stops*
Stops
Stops
4
4