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TSC80C51TXXX-36IA датащи(PDF) 4 Page - TEMIC Semiconductors

номер детали TSC80C51TXXX-36IA
подробное описание детали  CMOS 0 to 44 MHz Single-Chip 8 Bit Microcontroller
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производитель  TEMIC [TEMIC Semiconductors]
домашняя страница  http://www.temic.de
Logo TEMIC - TEMIC Semiconductors

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TSC80C31/80C51
Rev. E (14 Jan.97)
4
MATRA MHS
Pin Description
VSS
Circuit ground potential.
VCC
Supply voltage during normal, Idle, and Power Down
operation.
Port 0
Port 0 is an 8 bit open drain bi-directional I/O port. Port 0
pins that have 1’s written to them float, and in that state
can be used as high-impedance inputs.
Port 0 is also the multiplexed low-order address and data
bus during accesses to external Program and Data
Memory. In this application it uses strong internal pullups
when emitting 1’s. Port 0 also outputs the code bytes
during program verification in the TSC80C31/80C51.
External
pullups
are
required
during
program
verification. Port 0 can sink eight LS TTL inputs.
Port 1
Port 1 is an 8 bit bi-directional I/O port with internal
pullups. Port 1 pins that have 1’s written to them are
pulled high by the internal pullups, and in that state can
be used as inputs. As inputs, Port 1 pins that are externally
being pulled low will source current (IIL, on the data
sheet) because of the internal pullups.
Port 1 also receives the low-order address byte during
program verification. In the TSC80C31/80C51, Port 1
can sink or source three LS TTL inputs. It can drive
CMOS inputs without external pullups.
Port 2
Port 2 is an 8 bit bi-directional I/O port with internal
pullups. Port 2 pins that have 1’s written to them are
pulled high by the internal pullups, and in that state can
be used as inputs. As inputs, Port 2 pins that are externally
being pulled low will source current (ILL, on the data
sheet) because of the internal pullups. Port 2 emits the
high-order address byte during fetches from external
Program Memory and during accesses to external Data
Memory that use 16 bit addresses (MOVX @DPTR). In
this application, it uses strong internal pullups when
emitting 1’s. During accesses to external Data Memory
that use 8 bit addresses (MOVX @Ri), Port 2 emits the
contents of the P2 Special Function Register.
It also receives the high-order address bits and control
signals
during
program
verification
in
the
TSC80C31/80C51. Port 2 can sink or source three LS
TTL inputs. It can drive CMOS inputs without external
pullups.
Port 3
Port 3 is an 8 bit bi-directional I/O port with internal
pullups. Port 3 pins that have 1’s written to them are
pulled high by the internal pullups, and in that state can
be used as inputs. As inputs, Port 3 pins that are externally
being pulled low will source current (ILL, on the data
sheet) because of the pullups. It also serves the functions
of various special features of the TEMIC C51 Family, as
listed below.
Port Pin
Alternate Function
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
RXD (serial input port)
TXD (serial output port)
INT0 (external interrupt 0)
INT1 (external interrupt 1)
TD (Timer 0 external input)
T1 (Timer 1 external input)
WR (external Data Memory write strobe)
RD (external Data Memory read strobe)
Port 3 can sink or source three LS TTL inputs. It can drive
CMOS inputs without external pullups.
RST
A high level on this for two machine cycles while the
oscillator is running resets the device. An internal
pull-down resistor permits Power-On reset using only a
capacitor connected to VCC. As soon as the Reset is
applied (Vin), PORT 1, 2 and 3 are tied to one. This
operation is achieved asynchronously even if the
oscillator does not start-up.
ALE
Address Latch Enable output for latching the low byte of
the address during accesses to external memory. ALE is
activated as though for this purpose at a constant rate of
1/6 the oscillator frequency except during an external
data memory access at which time one ALE pulse is
skipped. ALE can sink/source 8 LS TTL inputs. It can
drive CMOS inputs without an external pullup.
If desired, ALE operation can be disabled by setting bit
0 of SFR location AFh (MSCON). With the bit set, ALE
is active only during MOVX instruction and external
fetches. Otherwise the pin is pulled low. MSCON SFR is
set to XXXXXXX0 by reset.


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