h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 692

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 18 LCD Controller/Driver
Table 18.4 Power-Down Modes and Display Operation
Notes: 1. The subclock oscillator does not stop, but clock supply is halted.
18.3.4
When a panel is driven, the on-chip power supply capacity may be insufficient. The recommended
solution in this case is to connect bypass capacitors of around 0.1 to 0.3 µF to pins V1 to V3, or to
connect a new split-resistance externally, as shown in figure 18.13.
Rev. 5.00 Sep 22, 2005 page 666 of 1136
REJ09B0257-0500
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.
H8S/2646 Group
Boosting the LCD Drive Power Supply
φ
φ
ACT = 0
ACT = 1
SUB
clock.
LPV
V
SS
Reset Active
Runs
Runs
Stops
Stops
Figure 18.13 Connection of External Split-Resistance
CC
Runs
Runs
Stops
Functions Functions Functions *
V1
V2
V3
Sleep
Runs
Runs
Stops
VR
R
R
R
Watch
Stops
Runs
Stops
SUB
, φ
R =
SUB
/2, or φ
several k to
several M
3
Subactive Subsleep
Runs
Stops
Functions *
Stops
SUB
/4 is selected as the operating
3
Stops
Runs
Stops
Functions *
C = 0.1 to 0.3 F
3
Standby
Stops
Stops *
Stops *
Stops *
1
2
2
Module
Standby
Stops *
Stops *
Stops
Stops
4
4