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PDF W78C32C Data sheet ( Hoja de datos )
| Número de pieza | W78C32C | |
| Descripción | 8-BIT MICROCONTROLLER | |
| Fabricantes | Winbond | |
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W78C32C
8-BIT MICROCONTROLLER
GENERAL DESCRIPTION
The W78C32C microcontroller supplies a wider frequency range than most 8-bit microcontrollers on
the market. It is compatible with the industry standard 80C32 microcontroller series.
The W78C32C contains four 8-bit bidirectional parallel ports, three 16-bit timer/counters, and a serial
port. These peripherals are supported by a six-source, two-level interrupt capability. There are 256
bytes of RAM, and the device supports ROMless operation for application programs.
The W78C32C microcontroller has two power reduction modes, idle mode and power-down mode,
both of which are software selectable. The idle mode turns off the processor clock but allows for
continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power
consumption. The external clock can be stopped at any time and in any state without affecting the
1.processor.
FEATURES
• 8-bit CMOS microcontroller
• Fully static design
• Low standby current at full supply voltage
• DC-40 MHz operation
• 256 bytes of on-chip scratchpad RAM
• ROMless operation
• 64K bytes program memory address space
• 64K bytes data memory address space
• Four 8-bit bidirectional ports
• Three 16-bit timer/counters
• One full duplex serial port
• Boolean processor
• Six-source, two-level interrupt capability
• Built-in power management
• Packages:
− DIP 40: W78C32C-24/40
− PLCC 44: W78C32CP-24/40
− QFP 44: W78C32CF-24/40
Publication Release Date: July 1999
- 1 - Revision A2
1 page  
W78C32C
FUNCTIONAL DESCRIPTION
The W78C32C architecture consists of a core controller surrounded by various registers, four general
purpose I/O ports, 256 bytes of RAM, three timer/counters, and a serial port. The processor supports
111 different instruction and references both a 64K program address space and a 64K data storage
space.
Timers 0, 1, and 2
Timers 0, 1, and 2 each consist of two 8-bit data registers. These are called TL0 and TH0 for Timer 0,
TL1 and TH1 for Timer 1, and TL2 and TH2 for Timer 2. The TCON and TMOD registers provide
control functions for timers 0, 1. The T2CON register provides control functions for Timer 2. RCAP2H
and RCAP2L are used as reload/capture registers for Timer 2.
The operations of Timer 0 and Timer 1 are the same as in the W78C31. Timer 2 is a special feature
of the W78C32C: it is a 16-bit timer/counter that is configured and controlled by the T2CON register.
Like Timers 0 and 1, Timer 2 can operate as either an external event counter or as an internal timer,
depending on the setting of bit C/T2 in T2CON. Timer 2 has three operating modes: capture, auto-
reload, and baud rate generator. The clock speed at capture or auto-reload mode is the same as that
of Timers 0 and 1.
Clock
The W78C32C is designed to be used with either a crystal oscillator or an external clock. Internally,
the clock is divided by two before it is used. This makes the W78C32C relatively insensitive to duty
cycle variations in the clock.
Crystal Oscillator
The W78C32C incorporates a built-in crystal oscillator. To make the oscillator work, a crystal must be
connected across pins XTAL1 and XTAL2. In addition, a load capacitor must be connected from each
pin to ground, and a resistor must also be connected from XTAL1 to XTAL2 to provide a DC bias
when the crystal frequency is above 24 MHz.
External Clock
An external clock should be connected to pin XTAL1. Pin XTAL2 should be left unconnected. The
XTAL1 input is a CMOS-type input, as required by the crystal oscillator. As a result, the external clock
signal should have an input one level of greater than 3.5 volts.
Power Management
Idle Mode
The idle mode is entered by setting the IDL bit in the PCON register. In the idle mode, the internal
clock to the processor is stopped. The peripherals and the interrupt logic continue to be clocked. The
processor will exit idle mode when either an interrupt or a reset occurs.
Power-down Mode
When the PD bit of the PCON register is set, the processor enters the power-down mode. In this
mode all of the clocks, including the oscillator are stopped. The only way to exit power-down mode is
by a reset.
Publication Release Date: July 1999
- 5 - Revision A2
5 Page 
TYPICAL APPLICATION CIRCUIT
Using External Program Memory and Crystal
W78C32C
V CC
10 u
8.2 K
CRYSTAL
C1 C2
31
19
R 18
EA
XTAL1
XTAL2
9 RST
12 INT0
13 INT1
14
15
T0
T1
1 P1.0
2 P1.1
3 P1.2
4 P1.3
5 P1.4
6 P1.5
7 P1.6
8 P1.7
W78C32C
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
RD
WR
PSEN
ALE
TXD
RXD
39 AD0
38 AD1
37 AD2
36 AD3
35 AD4
34 AD5
33 AD6
32 AD7
21 A8
22 A9
23 A10
24 A11
25 A12
26 A13
27 A14
28 A15
17
16
29
30
11
10
AD0 3
AD1 4
AD2 7
AD3 8
AD4 13
AD5 14
AD6 17
AD7 18
D0
D1
D2
D3
D4
D5
D6
D7
Q0 2 A0
Q1 5 A1
Q2 6 A2
Q3 9 A3
Q4 12 A4
Q5 15 A5
Q6 16 A6
Q7 19 A7
GND 1
11
OC
G
74LS373
A0 10
A1 9
A2 8
A3 7
A4 6
A5 5
A6 4
A7 3
A8 25
A9 24
A10 21
A11 23
A12 2
A13 26
A14 27
A15 1
GND 20
22
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
CE
OE
27512
O0
O1
11
12
O2 13
O3
O4
15
16
O5 17
O6 18
O7 19
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
Figure A
CRYSTAL
16 MHz
24 MHz
33 MHz
40 MHz
C1 C2
30P 30P
15P 15P
10P 10P
5P 5P
R
-
-
6.8K
6.8K
Above table shows the reference values for crystal applications.
Note: C1, C2, R components refer to Figure A.
- 11 -
Publication Release Date: July 1999
Revision A2
11 Page | ||
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| PDF Descargar | [ Datasheet W78C32C.PDF ] | |
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