PCF84C12AT PHILIPS [NXP Semiconductors], PCF84C12AT Datasheet - Page 5

• Manufacturer Part Number: PCF84C12AT
• Description: 8-bit microcontrollers
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
5
5.1
6
Since the I
not provided, instructions associated with these functions
are not available.
ROM space is restricted to 1 kbyte for the PCF84C12A,
2 kbytes for the PCF84C22A and 4 kbytes for the
PCF84C42A. Therefore, the instructions SEL MB1/2/3 for
the PCF84C12A and PCF84C22A, and the instructions
SEL MB2/3 for PCF84C42A should be avoided as they
would define non-existing program memory banks.
As RAM space is limited to 64 bytes, care should be taken
to avoid accesses to non-existing RAM locations.
Refer to the “PCF84CxxxA family” data sheet, for a
complete description of the instruction set.
1996 Nov 20
8-bit microcontrollers
PINNING INFORMATION
INSTRUCTION SET
Pinning
2
C-bus interface, Port 2 and derivative logic are
INT/T0
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
V SS
Fig.2 Pin configuration.
10
1
2
3
4
5
6
7
8
9
PCF84C12A
PCF84C22A
PCF84C42A
MBC952
19
18
17
16
15
14
13
12
11
20
V DD
P1.4
P1.3
P1.2
P1.1
P1.0
RESET
XTAL2
XTAL1
T1
5
5.2
Table 1 DIP20 and SO20 packages
P0.0 to P0.7
INT/T0
V
T1
XTAL1
XTAL2
RESET
P1.0 to P1.4
V
SS
DD
SYMBOL
Pin description
PCF84C12A; PCF84C22A;
15 to 19
1 to 8
PIN
10
12
13
14
20
11
9
TYPE
I/O
I/O
O
P
P
I
I
I
I
8 bits of Port 0: 8-bit
quasi-bidirectional
I/O port
Interrupt/Test 0
ground
Test 1/count input of
8-bit timer/event
counter 1
crystal oscillator
input or external
clock input
crystal oscillator
output
Reset input
4 bits of Port 1: 4-bit
quasi-bidirectional
I/O port
positive supply
PCF84C42A
Product specification
DESCRIPTION