C511_1 Datasheet, PDF (103/128 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

EEPROM Programming Interface
SAB-C513A-H
Table 9-1
Pin Definitions and Functions in Programming Mode (cont’d)
Symbol
PWR
PCS
XTAL2
XTAL1
PMS0
PMS1
PMS2
PMS3
Pin Number I/O*) Function
P-LCC-44
19
I
Programming Write Control
A low level at this pin (and PCS=low and PRD=high) causes the
data at AD0-7 to be written into the data or control registers of
the programming interface.
17
I
Programming Chip Select
A low level at this pin enables the access to the registers of the
programming interface. If PCS is active, either PRD or PWR
control whether data is read or written into the registers. PCS
should always be deactivated between subsequent accesses
to the programming interface.
20
– XTAL2
Output of the inverting oscillator amplifier.
21
– XTAL1
Input to the inverting oscillator amplifier and input to the internal
clock generator circuits.
To drive the device from an external clock source, XTAL1
should be driven, while XTAL2 is left unconnected. During the
device programming a clock must be always supplied.
35
I
Programming Mode Select
33
PMS0-3 are used to put the SAB-C513A-H into the program-
32
ming mode. In normal mode the programming mode select pins
10
have the meaning as shown in the table below. PMS0-3 must
be set to the logic level as described in the table below.
V_SS
V_CC
N.C.
22
–
44
–
1-9, 11-14, –
23-31, 24
*) I = Input
O = Output
Normal Mode
Pin Names
EA
ALE
PSEN
RESET
Progr. Mode
Pin Names
PMS0
PMS1
PMS2
PMS3
Required
Logic Level
0
1
0
1
Circuit ground potential
Power supply terminal for all operating modes
No connection
These pins must not be connected.
Semiconductor Group
9-3