PCF84C00T PHILIPS [NXP Semiconductors], PCF84C00T Datasheet - Page 6

• Manufacturer Part Number: PCF84C00T
• Description: 8-bit microcontroller with I2C-bus interface
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Table 2 PCF84C00T (see Fig.5)
1996 Nov 25
P2.2
SDA/P2.3
SCLK
P0.0 to P0.1
DXALE
n.c.
P0.2 to P0.7
INT/T0
T1
D0 to D2
A12
DXWR
n.c.
A11 to A6
V
A5 to A0
DXRD
D3 to D7
PSEN
XTAL1
XTAL2
SS
8-bit microcontroller with I
SYMBOL
16 to 18
22 to 27
29 to 34
36 to 40
8 to 13
PIN
4, 5
14
15
19
20
21
28
35
41
42
43
1
2
3
6
7
TYPE
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
P
I
I
I
1 bit of Port 2: 4-bit quasi-bidirectional I/O port
bidirectional data line of the I
quasi-bidirectional I/O port
2 bits of Port 0: 8-bit quasi-bidirectional I/O port
Address latch enable: on the falling edge of DXALE, the Dx address can be
latched in an external latch. This signal occurs only during execution of the
MOV Dx, A, MOV A, Dx, ANL Dx, A and ORL Dx, A instructions, with
x = 0 to 255. It is active during TS10 of cycle 1 and the first half of TS1 of
cycle 2.
not connected
6 bits of Port 0: 8-bit quasi-bidirectional I/O port
Interrupt/Test 0: external interrupt input (negative edge triggered)/test input
pin. When used as a test input, this pin is directly tested by conditional branch
instructions JT0 and JNT0; note 1.
Test 1: test input pin, directly tested by conditional branch instructions JT1 and
JNT1. T1 may also be selected as an input to the 8-bit timer/event counter via
the STRT CNT instruction.
3 bits of 8-bit data bus: for external memory and peripherals. The specified
Stop mode supply current is valid only if external pull-ups are connected to all
data lines.
1 bit of 13-bit address bus: for external memory and peripherals
Write strobe (active LOW): on the rising edge, data on D0-D7 may be written
to external registers. This signal occurs only during MOV Dx, A, ANL Dx, A
and ORL Dx, A instructions, with x = 0 to 255. It is active during TS7 of
cycle 2.
not connected
6 bits of 13-bit address bus: for external memory and peripherals
ground: circuit earth potential
6 bits of 13-bit address bus: for external memory and peripherals
Read strobe (active LOW): when this signal is active, external registers
emulating Dx registers can be read by the data bus. This signal occurs only
during execution of MOV A, Dx, ANL Dx, A and ORL Dx, A instructions, with
x = 0 to 255. It is active during TS3 and TS4 of cycle 2.
5 bits of 8-bit data bus: for external memory and peripherals. The specified
Stop mode supply current is valid only if external pull-ups are connected to all
data lines.
Program store enable (active LOW): PSEN is used to enable external
program memory and is active during TS9 and TS10 of each machine cycle
and TS1 of each following cycle. PSEN is HIGH during the Stop mode.
oscillator input: input from a crystal which determines the internal oscillator
frequency or an external clock generator
oscillator output: output of the inverting amplifier
bidirectional clock line of the I
2
C-bus interface
6
2
C-bus interface; or 1 bit of Port 2: 4-bit
2
DESCRIPTION
C-bus interface
Product specification
PCF84C00