Epson S1C33210 Technical Manual page 413

CNT2, CNT1: Output port data (D[1:0]) /Communications block output port data register (0x020000A)
Regardless of the communications macro select (MCRS) register (D[1:0]/0x200000) setting–that is, in all modes–
these bits drive the CNT2 and CNT1 output pins using negative logic. (See Table.)
GOUTE: GOUT output enable (D7) / Communications block input port data register (0x020000C)
Setting this bit to "1" connects the RI input to the GOUT output pin.
GOUTE setting
GOUTE = 1
GOUTE = 0
MIPORT1, MIPORT0: Input port data (D[1:0]) / Communications block input port data register
(0x020000C)
Regardless of the communications macro select (MCRS) register (D[1:0]/0x200000) setting–that is, in all modes–
these bits track the input levels for the corresponding pins.
RI, CTS, DCD, DSR: Modem status (D[11:8]) / Communications block modem status register
(0x020002A)
Regardless of the communications macro select (MCRS) register (D[1:0]/0x200000) setting–that is, in all modes–
these bits track the input levels for the corresponding pins using negative logic. Writes to these bits are ignored.
S1C33210 FUNCTION PART
III PERIPHERAL BLOCK: MONITORED MOBILE ACCESS INTERFACES
Table 10.16 Communications Block Outputs CNT2 and CNT1
Output port data
CNT2 = 1
CNT2 = 0
CNT1 = 1
CNT1 = 0
Table 10.17 Communications Block Output GOUT
RI input level
High
Low
High
Low
Table 10.18 Communications Block Inputs DSR and RI
Input pin Input Level
DSR High
Low
RI High
Low
Table 10.19 Communications Block Modem Status
Input pin Input Level
RI High
Low
CTS High
Low
DCD High
Low
DSR High
Low
Output pins Output level
CNT2 Low
High
CNT1 Low
High
GOUT output level
High
Low
High
High
Register Data
MIPORT1 = 1
MIPORT1 = 0
MIPORT0 = 1
MIPORT0 = 0
Register Data
RI = 0
RI = 1
CTS = 0
CTS = 1
DCD = 0
DCD = 1
DSR = 0
DSR = 1
EPSON
Notes
Pass through
output
Output disabled
B-III-10-27