Timer Counter - Epson SCE8720C Series Hardware Manual

1.8 Timer counter

SCE8720C has a 8254-equivalent timer counter and 3 independent timers. Their usage
and inputs are shown below:
Table 1.7 Timer 1 settings
Channel 0
System timer
Channel 1
Refresh request
Channel 2
Speaker interface
Rev.A
GATE 0 Fixed to ON
CLK IN 0 1.19MHz
CLK OUT 0 Connected to IRQ0 of interrupt controller 1.
GATE 1 Fixed to ON
CLK IN 1 1.19MHz
CLK OUT 1 Refresh request
GATE 2 Controlled by I/O port 61h.
CLK IN 2 1.19MHz
CLK OUT 2 Used to drive the speaker interface.
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