Epson RX801SJ Applications Manual page 23

RX8010 SJ
13.2.5. Diagram of fixed-cycle timer interrupt function
TMPIN[1:0]
TIE bit
Source clock
4096 Hz
64 Hz
1 Hz
1/60 Hz
1/3600 Hz
TSEL[2:0]
TE
TF ( "0" Clear )
Fixed-cycle timer starts
TE bit
TIE bit
/ IRQ1,2 output
TF bit
Event occurs
RTC internal operation
Write operation
∗ After the interrupt event that occurs when the count value changes from 0001h to 0000h, the counter automatically
reloads the preset value and again starts to count down. (Repeated operation)
∗ The count down that starts when the TE bit value changes from "0" to "1" always begins from the preset value.
16 bit counter
Operation of fixed-cycle timer
tRTN
period period
Page − 19
1
0
Timer Control
/tRTN
Circuit
tRTN
tRTN
period period
/IRQ1
/IRQ2
TF Flag
Fixed-cycle timer stops
tRTN
ETM37E-06
" 1 "
" 0 "
" 1 "
" 0 "
Hi - z
" L "
" 1 "
" 0 "