MiTAC 7521 N - Page 18

17
7521
7521
N/B MAINTENANCE
N/B MAINTENANCE
1.2.8 Keyboard system: H8(3434F) universal keyboard controller
 CPU
- Two-way general register configuration
- Eight 16-bit registers or Sixteen 8-bit registers
- High-speed operation
- Maximum clock rate: 16Mhz at 5V
 Memory
- Include 32KB ROM and 1KB RAM
 16-bit free-running timer
- One 16-bit free-running counter
- Two output-compare lines
- Four input capture lines
 8-bit timer (2 channels)
- Each channel has one 8-bit up-counter , two time constant registers
 PWM timer (2 channels)
- Resolution: 1/250
- Duty cycle can be set from 0 to 100%
 I²C bus interface (one channel)
- Include single master mode and slave mode
 Host interface (HIF)
- 8-bit host interface port
- Three host interrupt requests ( HIRQ1,11,12)
- Regular and fast A20 gate output