UPD784020 Datasheet, PDF (7/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCOMPUTER

mPD784020, 784021
2. MAIN DIFFERENCES BETWEEN mPD784026 AND mPD78234 SUB-SERIES
Series
mPD784026 sub-series
Item
mPD78234 sub-series
Number of basic instructions 113
65
(mnemonics)
Minimum instruction execution 160 ns
time
(at 25 MHz)
333 ns
(at 12 MHz)
Memory space (program/data) 1M byte in total
64K bytes/1M byte
Timer/counter
16-bit timer/counter ¥ 1
8/16-bit timer/counter ¥ 2
8/16-bit timer ¥ 1
16-bit timer/counter ¥ 1
8-bit timer/counter ¥ 2
8-bit timer ¥ 1
Clock output function
Available
Unavailable
Watchdog timer
Available
Unavailable
Serial interface
UART/IOE (3-wire serial I/O) ¥ 2 channels
CSI (3-wire serial I/O, SBI) ¥ 1 channel
UART ¥ 1 channel
CSI (3-wire serial I/O, SBI) ¥ 1 channel
Interrupt Context switching Available
Unavailable
Priority
4 levels
2 levels
Standby function
3 modes (HALT, STOP, IDLE)
2 modes (HALT, STOP)
Operation clock switching
Selectable from fXX/2, fXX/4, fXX/8, or fXX/16 Fixed to fXX/2
Pin
MODE pin
functions
Unavailable
To specify ROM-less mode
(always in the high level for the mPD78233
or mPD78237)
TEST pin
Pin for testing the device
Low level during ordinary use
Unavailable
Package
80-pin plastic QFP (14 ¥ 14 mm)
80-pin plastic TQFP (fine pitch)
(12 ¥ 12 mm): for the mPD784021 only
80-pin ceramic WQFN (14 ¥ 14 mm):
for the mPD78P4026 only
80-pin plastic QFP (14 ¥ 14 mm)
94-pin plastic QFP (20 ¥ 20 mm)
84-pin plastic QFJ (1150 ¥ 1150 mil)
94-pin ceramic WQFN (20 ¥ 20 mm):
for the mPD78P238 only
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