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1.1 MB91F109 Characteristics
Automati c wait cycle: Any number of cycles (0 to 7) can be set for ea ch area.
Unused d ata and address terminals can be used as I/O ports.
Support for little endian mode (selecting one of areas 1 to 5)
DRAM interface
2-bank in dependent control (areas 4 and 5)
Double CA S DRAM (normal DRAM interface), single CAS DRAM, and hyper DR AM
Basic bus cycle: Five cycles in nor mal mode. Two-cycle access i s enabled in high-speed
page mode.
Programm able waveform: Automatic 1-cycle wait can be inserted into R AS or CAS.
DRAM refresh
CBR refres h (The interval can be set as desired using the 6-bit timer .)
Self-re fresh mode
Support for 8-, 9-, 10-, or 12-line column address
Choice b etween 2CAS/1WE and 2WE/1CAS
DMAC (DMA controller)
Eight c hannels
Transfer cause: External terminal or internal resource interrupt request
Transfer s equence
Step trans fer or block transfer
Burst transfer or continuous transfer
Transfer data length: Selectable from 8, 16, and 32 bits
A temporar y stop is enabled by an NMI/interrupt request.
UART
Independe nt three channels
Full dupl ex double buffer
Data leng th: 7 to 9 bits (no parity) or 6 to 8 bits (with parity)
Choice b etween asynchronous (start-stop synchronization) communication and clock
asynchronous communication
Multiproc es so r mode
Built-in 16-bit timer (U-Timer) as a baud rate gene rator, which can generate a desired baud
rates
An extern al clock can be used as a transfer clock.
Error detec tion: Parity error, frame error, and overrun
A/D converter (successive approximation conversion type)
10-bit re solution, 4 channels
Succes sive approximation conversion type: 5.6 µs at 25 MHz
Built-in sample and hold circuit
Conve rsion mode: Selectable from single conversion, scan conversion, and repeat