FEDL671000-02
1
Semiconductor
ML671000
OVERVIEW OF INTERNAL PERIPHERAL FUNCTIONS
I/O Ports
The 64 I/O ports are configured from the 8-bit ports P0 to P7. Each bit of each port can be specified as an input
or output. If specified as an input, the port becomes a high impedance input. In addition to their port function
(primary function), some ports are assigned secondary functions such as an external interface function or an
I/O pin for an internal peripheral.
Timers
The timers consist of a 2-channel 16-bit flexible timer and a 2-channel 16-bit general-purpose timer. A count
clock can be selected for each channel.
- Flexible timer
Operating modes: auto-reload timer, compare-output, PWM, capture
- General-purpose timer
Auto-reload timer
- Synchronous timer operation
Timer channel can be started and stopped in union.
- Count clock
A count clock can be selected for each timer as: 1/1, 1/2, 1/4, 1/8, 1/16, and 1/32 of the system clock,
or as an external clock.
Time Base Generator
The time base generator consists of the time base counter, which drives frequency dividers deriving the time
base signals for on-chip peripherals from the system clock signals, and a watchdog timer, which counts time
base clock cycles and produces a system reset signal when its internal counter overflows.
UART Serial Port
Functionally the same as the 16550A, the UART serial port is equipped with 16-byte FIFOs for both receive
and transmit, modem control signals, a dedicated baud rate generator, etc.
- Full duplex operation
- Independent controls for transmit, receive, line status and data set interrupt
- Modem control signals: CTS, DSR, DCD, DTR, RTS and RI
- Built-in dedicated baud rate generator
- Data length:5, 6, 7, or 8 bits
- Stop bit:
1, 1.5, or 2 bits
- Parity:
odd, even, or none
- Detection of receive errors: parity error, framing error, overrun error, or data error of break interrupt
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