16 SEVEN-SEGMENT LED CONTROLLER (LEDC)
S1C17M12/M13 TECHNICAL MANUAL
Seiko Epson Corporation
16-1
(Rev. 1.2)
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.
(Note: See the table below.)
• 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.
Table 16.1.1 LEDC Configuration of S1C17M12/M13
Item
S1C17M12
S1C17M13
LED module supported
Maximum of five digits of seven-segment LED modules
SEG/COM outputs
8SEG
×
5COM
*
The S1C17M12/M13 power supply has been regulated for anode common.
LEDC
Clock
control circuit
COM output
control circuit
SEG output
control circuit
LICLKDIV[7:0]
NDIGITS[2:0]
BRITCNT[1:0]
COMMOD
CMOFFMOD
SGOFFMOD
DSPON
COM0[7:0]
COMx[7:0]
CLKSRC[1:0]
CLKDIV[2:0]
Clock generator
DBRUN
MODEN
CLK_LEDC
:
:
:
COM0
COMx
:
:
SEG0
SEG7
Interrupt control
circuit
COM0LTIE
COM0LTIF
Interrupt
controller
Inter
nal data
bu
s
Figure 16.1.1 LEDC Configuration