ST62T25CM6/TR STMicroelectronics, ST62T25CM6/TR Datasheet - Page 13

• Manufacturer Part Number: ST62T25CM6/TR
• Description: IC MCU 8BIT W/ADC 28-SOIC
• Manufacturer: STMicroelectronics
• Series: ST6r

Specifications of ST62T25CM6/TR

• Core Processor: ST6
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LVD, POR, WDT
• Number Of I /o: 20
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: OTP
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 6 V
• Data Converters: A/D 16x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -

MEMORY MAP (Cont’d)
3.1.6 Data ROM Window Mechanism
The Data read-only memory window is located
from address 0040h to address 007Fh in Data
space. It allows direct reading of 64 consecutive
bytes located anywhere in program memory, be-
tween address 0000h and 0FFFh.
There are 64 blocks of 64 bytes in a 4K device:
– Block 0 is related to the address range 0000h to
– Block 1 is related to the address range 0040h to
and so on...
All the program memory can therefore be used to
store either instructions or read-only data. The
Data ROM window can be moved in steps of 64
bytes along the program memory by writing the
appropriate code in the Data ROM Window Regis-
ter (DRWR).
Figure 5. Data ROM Window
0000h
0FFFh
003Fh.
007Fh.
PROGRAM
SPACE
64-BYTE
ROM
0FFh
07Fh
000h
040h
DATA SPACE
DATA ROM
WINDOW
3.1.6.1 Data ROM Window Register (DRWR)
The DRWR can be addressed like any RAM loca-
tion in the Data Space.
This register is used to select the 64-byte block of
program memory to be read in the Data ROM win-
dow (from address 40h to address 7Fh in Data
space). The DRWR register is not cleared on re-
set, therefore it must be written to before access-
ing the Data read-only memory window area for
the first time.
Address: 0C9h — Write Only
Reset Value = xxh (undefined)
Bits 7:6 = Reserved, must be cleared.
Bits 5:0 = DRWR[5:0] Data read-only memory
Window Register Bits. These are the Data read-
only memory Window bits that correspond to the
upper bits of the data read-only memory space.
Caution: This register is undefined on reset, it is
write-only, therefore do not read it nor access it us-
ing Read-Modify-Write instructions (SET, RES,
INC and DEC).
7
-
-
DRWR5 DRWR4 DRWR3 DRWR2 DRWR1 DRWR0
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