NEC 78K0 User Manual page 397

CSIAE0 ATE0 MASTER0 STBE0 BUSYE0 ERRE0 PM143 P143 PM144 P144 PM142 P142 PM145 P145 PM141 P141
× × × × ×
Note 1 Note 1
0
× ×
Note 1 Note 1
1 1 0 0/1
1 0 0 0/1
1 1 0/1
Notes 1. Can be set as port function.
2. Can be used as P143 when only transmission is performed. Clear bit 2 (RXEA0) of CSIMA0 to 0.
×:
Remark don't care
CSIAE0: Bit 7 of serial operation mode specification register 0 (CSIMA0)
ATE0: Bit 6 of CSIMA0
MASTER0: Bit 4 of CSIMA0
STBE0: Bit 5 of serial status register 0 (CSIS0)
BUSYE0: Bit 4 of CSIS0
ERRE0: Bit 2 of CSIS0
PM14×: Port mode register
P14×: Port output latch
Table 17-4. Relationship Between Register Settings and Pins
× × × × × ×
Note 1 Note 1 Note 1 Note 1 Note 1 Note 1
× ×
1 0 0 1
0 1
Serial I/O
Shift Register
0 Operation
× × × ×
Note 1 Note 1 Note 1 Note 1
Operation stopped
× × × ×
Note 1 Note 1 Note 1 Note 1
Operation enabled
× × × ×
Note 1 Note 1 Note 1 Note 1
×
0 0 1
*
Serial Clock Pin Function
Counter
SIA0/ SOA10/ SCKA0/ STB0/
Operation Control
P143 P144 P142 P145
P143 P144 P142 P145
Clear
Note 2
SIA0 SOA10 SCKA0 P145
Count operation
(input)
SCKA0 P145
(output)
STB0
BUSY0/
P141
P141
P141
P141
BUSY0