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12 16-bit Timers (T16)
12.1 Overview
T16 is a 16-bit timer. The features of T16 are listed below.
• 16-bit presettable down counter
• Provides a reload data register for setting the preset value.
• A clock source and clock division ratio for generating the count clock are selectable.
• Repeat mode or one-shot mode is selectable.
• Can generate counter underflow interrupts.
Figure 12.1.1 shows the configuration of a T16 channel.
Item
Number of channels
Event counter function
Peripheral clock output
(Outputs the counter
underflow signal.)
(
EXCLm
Clock generator
To CPU
(To peripheral circuit)
12.2 Input Pin
Table 12.2.1 shows the T16 input pin.
Pin name
EXCLm
If the port is shared with the EXCLm pin and other functions, the EXCLm input function must be assigned to the
port before using the event counter function. The EXCLm signal can be input through the chattering filter. For more
information, refer to the "I/O Ports" chapter.
S1C31W74 TECHNICAL MANUAL
(Rev. 1.1)
Table 12.1.1 T16 Channel Configuration of S1C31W74
Not supported (No EXCLm pins are provided.)
Ch.1 → Synchronous serial interface Ch.0 master clock
Ch.2 → Quad synchronous serial interface Ch.0 master clock
T16 Ch.n
TRMD
PRESET
PRUN
)
CLK_T16_n
CLKSRC[1:0]
CLKDIV[3:0]
DBRUN
MODEN
Figure 12.1.1 Configuration of a T16 Channel
Table 12.2.1 T16 Input Pin
I/O*
Initial status*
I
I (Hi-Z)
Seiko Epson Corporation
S1C31W74
4 channels (Ch.0–Ch.3)
Reload register
TR[15:0]
Timer control
circuit
Timer counter
TC[15:0]
Underflow
UFIE
Interrupt control
circuit
UFIF
External event signal input pin
* Indicates the status when the pin is configured for T16.
12 16-BIT TIMERS (T16)
Function
12-1
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