User’s Manual U12978EJ3V0UD
21
CHAPTER 1 GENERAL
1.1 Features
•
On-chip USB functions
•
Implements a USB (Universal Serial Bus) by connecting to Hub and Host.
•
Transfer speed: 1.5 Mbps (at 6.0 MHz operation with system clock)
•
On-chip regulator
•
Controls the USB port voltage by using a bus power supply (V
REG
= 3.3
±
0.3 V) dedicated to the USB
driver/receiver.
•
On-chip ROM and RAM
•
Internal ROM:
8 KB
Flash memory (for
µ
PD78F9801 only): 16 KB
•
Internal high-speed RAM:
256 bytes
•
Variable minimum instruction execution time: From high-speed (0.33
µ
s) to low speed (1.33
µ
s) with the system
clock operating at 6.0 MHz
•
31 I/O ports
•
Two serial interface channels
•
USB function
•
3-wire serial I/O mode
•
Three timers:
•
8-bit timer
•
8-bit timer/event counter
•
Watchdog timer
•
On-chip key return signal detector
•
12 vectored interrupt sources
•
Power supply voltage: V
DD
= 4.0 to 5.5 V
•
Operating ambient temperature: T
A
= –40 to +85
°
C (when the USB is not operating)
T
A
= 0 to +70
°
C (when the USB is operating)
T
A
= 10 to 40
°
C (when the flash memory is written)
1.2 Applications
USB keyboards, etc.
1.3 Ordering Information
Part Number Package Internal ROM
µ
PD789800GB-
×××
-8ES
44-pin plastic LQFP (10
×
10)
Mask ROM
µ
PD78F9801GB-8ES
44-pin plastic LQFP (10
×
10)
Flash memory
Remark
×××
indicates ROM code suffix.
