III PERIPHERAL BLOCK: MONITORED MOBILE ACCESS INTERFACES
S1C33210 FUNCTION PART EPSON B-III-10-27
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.)
Table 10.16 Communications Block Outputs CNT2 and CNT1
Output port data Output pins Output level
CNT2 = 1
CNT2 = 0
CNT2 Low
High
CNT1 = 1
CNT1 = 0
CNT1 Low
High
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.
Table 10.17 Communications Block Output GOUT
GOUTE setting RI input level GOUT output level Notes
GOUTE = 1 High
Low
High
Low
Pass through
output
GOUTE = 0 High
Low
High
High
Output disabled
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.
Table 10.18 Communications Block Inputs DSR and RI
Input pin Input Level Register Data
DSR High
Low
MIPORT1 = 1
MIPORT1 = 0
RI High
Low
MIPORT0 = 1
MIPORT0 = 0
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.
Table 10.19 Communications Block Modem Status
Input pin Input Level Register Data
RI High
Low
RI = 0
RI = 1
CTS High
Low
CTS = 0
CTS = 1
DCD High
Low
DCD = 0
DCD = 1
DSR High
Low
DSR = 0
DSR = 1
