Z90120

The Z901XX 40-pin Digital Television Controller is a costeffective member of the Z8^® single-chip microcontroller family. The device provides an ideal performance and  reliability solution for consumer and industrial television applications.

The Z901XX offers mask-programmed ROM, which enables the Z8 microcontroller to be used in a high-volume production application device embedded with a custom program (customer-supplied program) and combines to provide support for mid-range and low-end TV applications.

The device features an 8-bit internal data path controlled by a Z8 microcontroller, On-Screen Display (OSD) logic circuits, and Pulse Width Modulators (PWM). On-chip peripherals include two register mapped I/O ports (Ports 2 and Port 3), interrupt control logic (one software, two external and three internal interrupts) and a standby mode recovery input port (Port 3, pin P30).

The OSD control circuits support six rows by 20 columns of characters. The character color is specified by row. One of the eight rows is assigned to show two kinds of colors for bar type displays such as volume control. The OSD is capable of displaying either low resolution (5x7 dot pattern) or high resolution (11x15 dot pattern) characters.

A 14-bit PWM port provides enough voltage resolution for a voltage synthesizer tuning system. Three 6-bit PWM ports are used for controlling audio signal levels, and  Three 8-bit PWM ports used to vary picture levels.  Three basic address spaces, The Program Memory, Video RAM, and Register File, support a wide range of memory configurations.

For applications demanding powerful I/O capabilities, the Z901XX's dedicated input and output lines are grouped  into three ports, and are configurable under software  cotrol to provide timing, status signals, parallel I/O and an address/data bus for interfacing to external memory.

To unburden the program from coping with the real-time problems such as counting/timing and data communication, the Z901XX offers two on-chip counter/timers with a large number of user selectable modes.