UPD70325 Datasheet, PDF (3/80 Pages) NEC – V25+TM 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD70325
Comparison between V25 and V25+
V25
V35^TM
V25+
V35+^TM
µPD70320
µPD70330
µPD70325
µPD70335
Transfer processing method
Depends on microprogram
Depends on dedicated hardware
Maximum transfer rate (8-MHz
operation)
0.6 Mbytes/second 0.8 Mbytes/second 4 Mbytes/second 5.3 Mbytes/second
Sampling timing of DMA request
Between instruction execution cycles Between bus cycles
DMA service channel
In on-chip RAM area
In special function register
Specification method of transfer address Segment method
Linear method
Execution format in single-step mode 1 DMA transfer/1 instruction execution
DMA _{Interrupt request during DMA transfer Accepts only NMI}
function _{(demand release mode)}
1 DMA transfer/1 bus cycle
Not accepted
Number of necessary waits when
stop is controlled by DMARQ
(demand release mode)
Not necessary
2 waits
Transfer processing units
Byte/word
Byte/word
Byte
Byte/word
TC (terminal counter) setting value Number of times of DMA transfer
(Number of times of DMA transfer) – 1
Generation timing of terminal counter TC = 0
TC = FFFFH
TC output low-level width
Fixed
Expanded by wait insertion
Transmit clock output in
asynchronous mode (channel 0)
Not available
Available (SCK0 pin)
Serial ^{Serial error register}
Yes
interface Receive buffer full flag
No
Serial status register
In serial status register
Transmit buffer empty flag
No
In serial status register
All sent flag
Interrupt
function
Interrupt source register
External data bus
No
No
8 bits
16 bits
In serial status register
Yes
8 bits
16 bits
Maximum operating frequency
8 MHz
10 MHz
3