KS57C5532 Key Features
- 1 K × 4-bit RAM 32 K × 8-bit ROM Bit Sequential Carrier
- Supports 8-bit serial data transfer in arbitrary format
- Input only: 4 pins I/O: 43 pins N-channel open-drain I/O (S/W): 8 pins
- 3 external interrupt vectors 4 internal interrupt vectors 2 quasi-interrupts
- Data memory bank 15
- Idle: Only CPU clock stops Stop: Main system clock stops Subsystem clock stop mode
- 16 dual-tone frequencies for tone dialing
- Programmable internal timer Watchdog timer
- Crystal, ceramic for main system clock Crystal oscillator for subsystem clock Main system clock frequency: 3.579545 MHz
- Programmable interval timer External event counter function Timer/counters clock outputs to TCLO0 and TCLO1 pins Externa