Hitachi H8S/2646 Hardware Manual page 667

Bits 3 to 0—Segment Driver Select 3 to 0 (SGS3 to SGS0): Bits 3 to 0 select the segment
drivers to be used.
• H8S/2646, H8S/2646R, H8S/2645
Bit 3: Bit 2: Bit 1: Bit 0:
SGS3 SGS2 SGS1 SGS0
0 0 0 0
1
1 0
1
1 0 0
1
1
*
1 * * *
Note: When using external expansion, set a value of 0000 for SGS3 to SGS0. When the setting of
SGS3 to SGS0 is 0000, COM4 to COM1 also function as ports.
Function of Pins SEG24 to SEG1
SEG24 to SEG16 to
SEG17 SEG13
Port Port
SEG Port
SEG SEG
SEG SEG
SEG SEG
SEG SEG
Setting Setting
prohibited prohibited
Setting Setting
prohibited prohibited
SEG12 to SEG8 to
SEG9 SEG5
Port Port
Port Port
Port Port
SEG Port
SEG SEG
SEG SEG
Setting Setting
prohibited prohibited
Setting Setting
prohibited prohibited
SEG4 to
SEG1 Notes
Port Initial value (external
expansion enabled)
Port External expansion
not possible
Port
Port
Port
SEG
Setting
prohibited
Setting
prohibited
*: Don't care
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