TC93P27F

2002-11-18

2

and DO1 pins can be switched by instruction to IN1 (input-only) or OT2 (output-only). In addition, 9 output

LCD output pins for S17 to S25 can be switched to I/O port in 1-bit units.

· Three backup modes available by instruction: only CPU operation, crystal oscillation only, clock stop.

· Features a built-in 2-Hz timer F/F and a built-in 10/100 Hz interval pulse outputs (internal port for time base).

· Allows PLL lock status detection.

· Four of the LCD segment outputs (S22 to S25) can also operate as key return timing outputs (KR0 to KR3). The

I/O ports are not dedicated for key return timing outputs but can have other uses as well.

· Built-in 20-bit, general-purpose IF counters can detect stations during auto-tuning by counting the intermediate

frequencies of each band.

· Built-in buzzer output circuit can output 8 kinds of frequencies in 4 modes: continuous output, single-shot

output, 10-Hz intermittent output, and 10-Hz intermittent 1-Hz interval output.

· Features built-in 12-bit PWM circuit usable for easy-to-use D/A converter.

· Features a built-in 3-channel, 6-bit A/D converter.

· To prevent CPU malfunction, a built-in supply voltage drop detection circuit shuts down the CPU when the

voltage falls below 1.55 V.

· MASK ROM product: TC9327AF