w78c31b Winbond Electronics Corp America, w78c31b Datasheet
w78c31b
Available stocks
Related parts for w78c31b
w78c31b Summary of contents
Page 1
... The W78C31B microcontroller supplies a wider frequency range than most 8-bit microcontrollers on the market compatible with the industry standard 80C31 microcontroller series. The W78C31B contains four 8-bit bidirectional parallel ports, two 16-bit timer/counters, and a serial port. These peripherals are supported by a five-source, two-level interrupt capability. There are 128 bytes of RAM, and the device supports ROMless operation for application programs ...
Page 2
... ALE 12 29 INT0, P3.2 PSEN 13 P2.7, A15 28 INT1, P3.3 14 T0, P3.4 27 P2.6, A14 T1, P3 P2.5, A13 16 WR, P3.6 25 P2.4, A12 17 24 P2.3, A11 RD, P3.7 18 P2.2, A10 XTAL2 23 XTAL1 19 22 P2. P2.0, A8 VSS 21 44-Pin QFP/TQFP (W78C31BF/W78C31BM P1.5 P0.4, AD4 39 38 P1.6 P0.5, AD5 37 P0.6, AD6 P1.7 RST 36 P0.7, AD7 RXD, P3 TXD, P3.1 33 ALE INT0, P3 ...
Page 3
... P3.7 EA External Address Input, active low. This pin forces the processor to execute out of external ROM. This pin should be kept low for all W78C31B operations. RST Reset Input, active high. This pin resets the processor. It must be kept high for at least two machine cycles in order to be recognized by the processor. ...
Page 4
... Crystal 2. This is the crystal oscillator output the inversion of XTAL1 Power Supplies. These are the chip ground and positive supplies. BLOCK DIAGRAM RAM 128 Bytes SFR CPU Data Bus CORE Interrupt - 4 - W78C31B Port 0 Port 1 Port 2 Port 3 Alternate Serial Port Timer 0 Timer 1 INT 0 INT 1 ...
Page 5
... The external RESET signal is sampled at S5P2. To take effect, it must be held high for at least two machine cycles while the oscillator is running. An internal trigger circuit in the reset line is used to deglitch the reset line when the W78C31B is used with an external RC network. The reset logic also has a special glitch removal circuit that ignores glitches on the reset line ...
Page 6
... < V < 4.5V OL1 OL1 4.5V OL2 OL2 4.5V OH1 -100 A OH1 4.5V OH2 -400 A OH2 - 6 - W78C31B MAX. UNIT +7.0 -0 +150 SPECIFICATION MIN. TYP. MAX. 4 -75 - +10 - +184 +350 - 0.45 2 ...
Page 7
... 4.5V IL2 5.5V IH1 5.5V IH2 OP, CP SYMBOL MIN. TYP W78C31B SPECIFICATION MIN. TYP. MAX 0 0.8 2 +0 and actual parts will CP MAX. UNIT NOTES - 40 MHz - - Publication Release Date: October 1997 Revision A3 ...
Page 8
... DAD CP DWD CP DWR CP CP SYMBOL MIN. TYP PDS PDH PDA W78C31B MAX. UNIT NOTE MAX. UNIT NOTE S nS ...
Page 9
... PSEN PORT 2 A0-A7 PORT ALW T APL T PSW T AAS A8-A15 T PDA T T PDH, PDZ A0-A7 A0-A7 Data Code A0- A8-A15 DATA T T DAR DDA T DDH, T DRD - 9 - W78C31B Data A0- DDZ Publication Release Date: October 1997 Revision A3 ...
Page 10
... Data Write Cycle S4 XTAL1 ALE PSEN PORT 2 PORT 0 A0-A7 WR Port Access Cycle XTAL1 ALE T PDS PORT INPUT SAMPLE A8-A15 DATA OUT T DAD T T DWR DAW PDH - 10 - W78C31B DWD S1 T PDA DATA OUT ...
Page 11
... A14 P2.6 P1.0 28 A15 P2.7 P1 P1.4 PSEN 29 P1.5 ALE 30 P1.6 TXD 11 P1.7 RXD 10 W78C31B Figure 30P 30P 15P 15P 10P 10P W78C31B AD0 AD1 AD2 AD3 ...
Page 12
... A14 P2.7 28 P1 P1.3 PSEN 29 P1.4 30 P1.5 ALE 11 P1.6 TXD 10 P1.7 RXD W78C31B Figure Base Plane A 1 Seating Plane W78C31B AD0 AD1 AD2 AD3 AD4 ...
Page 13
... Detail W78C31B Dimension in inch Dimension in mm Symbol Min. Nom. Max. Nom. Min. Max. A 0.185 4.699 A 0.020 0.508 1 0.150 3.81 A 0.145 0.155 3.683 3.937 2 b 0.026 0.028 0.032 0.66 0.711 ...
Page 14
... Detail F 1 Winbond Electronics (H.K.) Ltd. Rm. 803, World Trade Square, Tower II, 123 Hoi Bun Rd., Kwun Tong, Kowloon, Hong Kong TEL: 852-27513100 FAX: 852-27552064 - 14 - W78C31B Dimension in inch Dimension in mm Symbol Min. Nom. Max. Min. Nom. Max. --- --- A --- 0.047 --- 1.20 A 0.002 ...