SM8521 Datasheet, PDF (30/56 Pages) Sharp Electrionic Components – 8-Bit Single-Chip Microcomputer

P3C (Control register)
Bit 7
0
P3C7 P3C6 P3C5 P3C4 P3C3 P3C2 P3C1 P3C0
Bits 7 to 6 :
BIT
CONTENT
00 Input
01 Input (with pull-up resistor)
10 Output/(Timer 1 clock outputs through P37)
11 Output/(Timer 1 clock outputs through P37)
Bits 5 to 4 :
BIT
CONTENT
00 Input
01 Input (with pull-up resistor)
10 Output
11 Output (open-drain)
SM8521
Bits 3 to 2 :
BIT
CONTENT
00 Input
01 Input (with pull-up resistor)
10 Output
11 Output (open-drain)
Bits 1 to 0 :
BIT
CONTENT
00 Input
01 Input (with pull-up resistor)
10 Output
11 Output (open-drain)
TIMER/COUNTERS
The SM8521 supports 8-bit timer x 2, and clock
timer x 1. One out of 8-bit prescaler output can be
selected as an 8-bit timer input.
Internal bus
fCK
Control register
Data register
8-bit prescaler
8-bit up-counter
Fig. 13 8-Bit Timer Block Diagram
Comparator
Interrupt
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