SAK-C164CM-4EF Infineon Technologies AG, SAK-C164CM-4EF Datasheet - Page 11

• Manufacturer Part Number: SAK-C164CM-4EF
• Description: 16-Bit Single-Chip Microcontrol ler
• Manufacturer: Infineon Technologies AG

Table 2
Symbol Pin
P20
P20.0
P20.1
P20.4
P20.5
P20.8
P20.12
Data Sheet
No.
28
29
30
31
34
35
Pin Definitions and Functions (cont’d)
Input
Outp.
IO
O
O
O
I
–
O
O
O
Function
Port 20 is a 6-bit bidirectional I/O port (no P20.5 output driver
in the OTP versions). It is bit-wise programmable for input or
output via direction bits. For a pin configured as input, the
output driver is put into high-impedance state.
The following Port 20 pins also serve for alternate functions:
RD
WR
ALE
Can be used for latching the address into external memory
or an address latch in the multiplexed bus modes.
EA
A low level at this pin during and after Reset forces the
C164CM to latch the configuration from PORT0 and pin RD,
and to begin instruction execution out of external memory.
A high level forces the C164CM to latch the configuration
from pins RD, ALE, and WR, and to begin instruction
execution out of the internal program memory.
“ROMless” versions must have this pin tied to ‘0’.
V
The OTP versions of the C164CM receive the programming
voltage via this pin. (No output driver for P20.5 in this case!)
CLKOUT
FOUT
RSTOUT
to a low level when the part is executing either a hardware-,
a software- or a watchdog timer reset. RSTOUT remains low
until the EINIT (end of initialization) instruction is executed.
PP
External Memory Read Strobe, activated for
every external instruction or data read access.
External Memory Write Strobe, activated for
every external data write access.
Address Latch Enable Output.
External Access Enable pin.
OTP Programming voltage
System Clock Output (= CPU Clock),
Programmable Frequency Output
Internal Reset Indication Output. This pin is set
7
V1.0, 2001-05
C164CM
C164SM