Seven-Segment Led Controller (Ledc); Overview - Epson S1C17M12 Technical Manual

16 Seven-Segment LED Controller (LEDC)

16.1 Overview

LEDC is a seven-segment LED module control circuit. The features of the LEDC are listed below.
• Supports a maximum of eight digits of seven-segment LED modules.
• Dynamic lighting method (Lighting of the LED module is controlled dynamically using the segment signals
common to all digits and the common signals that activate each digit in time division.)
• Allows selection of the clock source and division ratio to finely set the dynamic lighting cycle.
• Four-level brightness adjustment function (achieved by changing the common signal on time)
• Allows software to select anode common or cathode common.
• Allows software to configure the COM/SEG pin status at off time (specified level output, Hi-Z).
• Can generate interrupts in the common signal cycles.
Figure 16.1.1 shows the LEDC configuration.
Item
LED module supported
SEG/COM outputs
* The S1C17M12/M13 power supply has been regulated for anode common.
Clock generator
Interrupt
controller
S1C17M12/M13 TECHNICAL MANUAL
(Rev. 1.2)
Table 16.1.1 LEDC Configuration of S1C17M12/M13
S1C17M12
Maximum of five digits of seven-segment LED modules
LEDC
CLK_LEDC
CLKSRC[1:0]
CLKDIV[2:0]
DBRUN
control circuit
MODEN
LICLKDIV[7:0]
NDIGITS[2:0]
BRITCNT[1:0]
COM output
CMOFFMOD
control circuit
DSPON
COMMOD
SGOFFMOD
SEG output
COM0[7:0]
control circuit
:
COMx[7:0]
Interrupt control
COM0LTIE
Figure 16.1.1 LEDC Configuration
Seiko Epson Corporation
16 SEVEN-SEGMENT LED CONTROLLER (LEDC)
(Note: See the table below.)
8SEG × 5COM
Clock
:
:
circuit
COM0LTIF
S1C17M13
COM0
:
COMx
SEG0
:
SEG7
16-1