Bit 4: Expansion Signal Selection (SGX)
Bit 4 (SGX) selects whether the SEG40/CL1, SEG39/CL2, SEG38/DO and SEG37/M pins are used as
segment pins (SEG40 to SEG37) or as segment external expansion signal pins (CL1, CL2, DO and
M).
Bit 4
SGX
Description
0
SEG40 to SEG37 pins*
(Initial value)
1
CL1, CL2, DO and M pins
Note:
*
Functions as ports when SGS3 to SGS0 are set at “0000”.
Bits 3 to 0: Segment driver select 3 to 0 (SGS3 to SGS0)
Bits 3 to 0 select the segment drivers to be used.
Function of Pins SEG40 to SEG1
SEG40 SEG32 SEG24 SEG16 SEG8
Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 to to to to to
SGX SGS3 SGS2 SGS1 SGS0 SEG33 SEG25 SEG17 SEG9 SEG1
Notes
(Initial value)
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
1
0
0
0
0
1
0
0
0
1
1
*
0
0
0
1
*
0
0
1
0
1
*
0
0
1
*
*
0
1
*
*
*
*
0
1
*
*
*
Port
Port
Port
Port
Port
SEG
SEG
SEG
Port
Port
Port
Port
Port
SEG
SEG
Port
Port
Port
Port
Port
Port
SEG
Port
SEG
SEG
SEG
SEG
SEG
Port
SEG
SEG
SEG
SEG
Port(*1) Port
Do not use
Note: 1. SEG40 to SEG37 are external expansion pins.
*: Don’t care
347
ETC [ ETC ]
