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9.8
Port A
9.8.1
Overview
Port A is an 8-bit I/O port. Port A pins also function as address bus outputs and LCD driver output
pins (H8S/2646, H8S/2646R, H8S/2645: SEG24 to SEG21 and COM4 to COM1, H8S/2648,
H8S/2648R, H8S/2647: SEG40 to Seg37 and COM4 to COM1). The pin functions change
according to the operating mode.
Port A has a built-in MOS input pull-up function that can be controlled by software.
Figure 9-7 shows the port A pin configuration.
Port A pins
PA7 / A23 / SEG24
PA6 / A22 / SEG23
PA5 / A21 / SEG22
PA4 / A20 / SEG21
Port A
PA3 / A19 / COM4
PA2 / A18 / COM3
PA1 / A17 / COM2
PA0 / A16 / COM1
Notes: *1 In the H8S/2646, H8S/2646R, and H8S/2645.
*2 In the H8S/2648, H8S/2648R, and H8S/2647.
Pin functions in modes 4 to 6
*1
*2
/ SEG40
PA7 (I/O) / A23 (output) / SEG24
*1
*2
/ SEG39
PA6 (I/O) / A22 (output) / SEG23
*1
*2
/ SEG38
PA5 (I/O) / A21 (output) / SEG22
*1
*2
/ SEG37
PA4 (I/O) / A20 (output) / SEG21
*1
*2
/ COM4
PA3 (I/O) / A19 (output) / COM4
*1
*2
/ COM3
PA2 (I/O) / A18 (output) / COM3
*1
*2
/ COM2
PA1 (I/O) / A17 (output) / COM2
*1
*2
/ COM1
PA0 (I/O) / A16 (output) / COM1
Mode 7 pins
PA7 (I/O) / SEG24
PA6 (I/O) / SEG23
PA5 (I/O) / SEG22
PA4 (I/O) / SEG21
PA3 (I/O) / COM4
PA2 (I/O) / COM3
PA1 (I/O) / COM2
PA0 (I/O) / COM1
Figure 9-7 Port A Pin Functions
*1
(output) / SEG40
*1
(output) / SEG39
*1
(output) / SEG38
*1
(output) / SEG37
*1
(output) / COM4
*1
(output) / COM3
*1
(output) / COM2
*1
(output) / COM1
*1
*2
(output) / SEG40
(output)
*1
*2
(output) / SEG39
(output)
*1
*2
(output) / SEG38
(output)
*1
*2
(output) / SEG37
(output)
*1
*2
(output) / COM4
(output)
*1
*2
(output) / COM3
(output)
*1
*2
(output) / COM2
(output)
*1
*2
(output) / COM1
(output)
*2
(output)
*2
(output)
*2
(output)
*2
(output)
*2
(output)
*2
(output)
*2
(output)
*2
(output)
255
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