ST10R272L STMicroelectronics, ST10R272L Datasheet - Page 7

• Manufacturer Part Number: ST10R272L
• Description: 16-BIT Romless MCU WITH MAC UNIT
• Manufacturer: STMicroelectronics

Specifications of ST10R272L

• Cpu Frequency: 0 to 50 MHz
• Power: 3.3 Volt +/-0.3V

P4.0–
P4.7
RD
WR/
WRL
READY/
READY
23-26
29-32-
23
...
26
29
30
31
32
33
34
35
I/O
O
...
O
O
O
O
O
O
I/O
O
O
O
O
I
5T
5T
...
5T
5T
5T
5T
5T
5T
5T
5T
5T
5T
5T
5T
Table 1 Pin definitions
An 8-bit bidirectional I/O port. Port 8 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.
Port 4 can be used to output the segment address lines for
external bus configuration.
P4.0
...
P4.3
P4.4
P4.5
P4.6
P4.7
External Memory Read Strobe. RD is activated for every exter-
nal instruction or data read access.
External Memory Write Strobe. In WR-mode, this pin is acti-
vated for every external data write access. In WRL-mode, this
pin is activated for low byte data write accesses on a 16-bit
bus, and for every data write access on an 8-bit bus.
See WRCFG in the SYSCON register for mode selection.
Ready Input. Active level is programmable. When the Ready
function is enabled, the selected inactive level at this pin dur-
ing an external memory access will force the insertion of mem-
ory cycle time waitstates until the pin returns to the selected
active level. Polarity is programmable.
A16
...
A19
A20
SSPCE1
A21
SSPCE0
A22
SSPDAT
A23
SSPCLK
Least Significant Segment Addr. Line
...
Segment Address Line
Segment Address Line
Segment Address Line
SSPChip Enable Line 0
Segment Address Line
SSP Data Input/Output Line
Most Significant Segment Addr. Line
SSP Clock Output Line
Chip Enable Line 1
ST10R272L - PIN DESCRIPTION
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