UPD784031 Datasheet, PDF (7/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD784031
2. MAIN DIFFERENCES BETWEEN µPD784038, µPD784038Y, µPD784026, AND µPD78234 SUB-
SERIES
Item
Series
µPD784038 sub-series
µPD784038Y sub-series
µPD784026 sub-series
µPD78234 sub-series
Number of basic instructions 113
65
(mnemonics)
Minimum instruction execution 125 ns
time
(at 32 MHz)
160 ns
(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, 2-wire
serial I/O, I²C bus^Note)
× 1 channel
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 µPD78233 or µPD78237)
TEST pin
Pin for testing the device
Low level during ordinary use
Unavailable
Package
80-pin plastic QFP
(14 × 14 × 2.7 mm)
80-pin plastic QFP
(14 × 14 × 1.4 mm)
80-pin plastic TQFP
(fine pitch) (12 × 12 mm)
80-pin ceramic WQFN
(14 × 14 mm):
for the µPD78P4038 and
µPD78P4038Y only
80-pin plastic QFP
(14 × 14 × 2.7 mm)
80-pin plastic TQFP
(fine pitch) (12 × 12 mm):
for the µPD784021 only
80-pin ceramic WQFN
(14 × 14 mm):
for the µPD78P4026 only
80-pin plastic QFP
(14 × 14 × 2.7 mm)
94-pin plastic QFP
(20 × 20 mm)
84-pin plastic QFJ
(1 150 × 1 150 mil)
94-pin ceramic WQFN
(20 × 20 mm):
for the µPD78P238 only
Note For the µPD784038Y sub-series only.
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