UPD78908x

主要特色：

Operating voltage: VDD = 1.8 to 5.5 V
Max. frequency: 5 MHz
ROM capacities: 32 KB flash memory
RAM capacities: 256 bytes
30-pin plastic SSOP package
System clock: Ceramic/crystal oscillation
Minimum instruction execution time can be changed to high-speed (0.4 µs), medium-speed (0.8 µs), and lowspeed (1.6 µs) (@ 5.0 MHz operation with system clock, VDD = 2.7 to 5.5 V)
I/O ports: 24
Timer: 5 channels

• 16-bit timer: 1 chennel
• 8-bit timer: 3 channel
• Watchdog timer: 1 channel

Serial interface: 1 channel

• 3-wire serial I/O mode/UART mode: 1 channel

On-chip key return signal detector
On-chip power-on-clear circuit and low-voltage detector
Operating ambient temperature: TA = -40 to +85°C