Outputs From The #Rdet, #Irq And #Det Pins - Epson S1C05251 Technical Manual

3 FUNCTIONAL DESCRIPTION

3.2 Outputs from the #RDET, #IRQ and #DET Pins

The signals output from the #RDET, #IRQ, and #DET pins changes according to the operation mode. Table 3.2.1
lists the corresponding between the operation mode and the pin function.
PDWN MODE1 MODE0
0 0 0
0 0 0
0 0 1
0 0 1
1 0 X
0 1 0
0 1 0
0 1 1
0 1 1
1 1 X
12
Table 3.2.1 Pin functions in each operation mode
SEL
Function
bit
0 RING detection
FSK receiving
1 CPM detection
RING detection
0 CAS detection
RING detection
1 CAS detection
RING detection
X Zero-power mode
RING detection
0 FSK detection
Hook detection
1 CPM detection
Hook detection
0 CAS detection
Hook detection
1 CAS detection
Hook detection
X FSK energy detection
mode
RING detection
Hook detection
FSK energy detection
FSK CAS
#RDET
input pin input pin
INP/INN Off RING
detection
INP/INN Off RING
detection
Off INP/INN RING
detection
Off CASIN RING
detection
Off Off RING
detection
INP/INN Off Off-hook
detection
INP/INN Off Off-hook
detection
Off INP/INN Off-hook
detection
Off CASIN Off-hook
detection
INP/INN Off Off-hook
detection
EPSON
Power
#IRQ #DET
mode
FSK receive FSK signal Power
completion detection
CPM CPM signal
detection output
CAS CAS
detection detection
CAS CAS
detection detection
RING RING Power
detection detection down
FSK receive FSK signal Power
completion detection
CPM CPM signal
detection output
CAS CAS
detection detection
CAS CAS
detection detection
RING RING Power
detection detection down
or
FSK energy
detection
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