ST10C167 Datasheet, PDF (8/65 Pages) STMicroelectronics – 16-BIT MCU WITH 32K BYTE ROM

ST10C167
II - PIN DATA (continued)
Table 1 : Pin list (continued)
Symbol
WR/W RL
READY/READY
ALE
EA
P0L.0 - P0L.7
P0H.0
P0H.1 - P0H.7
P1L.0 - P1L.7
P1H.0 - P1H.7
XTAL1
XTAL2
RSTIN
Pin
96
97
98
99
100 - 107
108
111 - 117
118 - 125
128 - 135
132
133
134
135
138
137
140
Type
Funct ion
O External Memory Write Strobe. In WR-mode this pin is activated 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 register SYSCON for mode selection.
I Ready Input. The active level is programmable. When the Ready function
is enabled, the selected inactive level at this pin during an external mem-
ory access will force the insertion of memory cycle time waitstates until
the pin returns to the selected active level.
O Address Latch Enable Output. Can be used for latching the address into
external memory or an address latch in the multiplexed bus modes.
I External Access Enable pin. A low level at this pin during and after Reset
forces the ST10C167 to begin instruction execution out of external mem-
ory. A high level forces execution out of the internal Flash Memory.
I/O Port 0 consists of the two 8-bit bidirectional I/O ports P0L and P0H. It is
bit-wise programmable for input or output via direction bits. For a pin con-
figured as input, the output driver is put into high-impedance state. In case
of an external bus configuration, Port 0 serves as the address (A) and
address/data (AD) bus in multiplexed bus modes and as the data (D) bus
in demultiplexed bus modes.
Demultiplexed bus modes:
Data Path Width : 8-bit
P0L.0 – P0L.7 : D0 – D7
P0H.0 – P0H.7 : I/O
Multip lexed bus modes:
16-bit
D0 - D7
D8 - D15
Data Path Width : 8-bit
16-bit
P0L.0 – P0L.7 : AD0 – AD7 AD0 - AD7
P0H.0 – P0H.7 : A8 - A15 AD8 - AD15
I/O Port 1 consists of the two 8-bit bidirectional I/O ports P1L and P1H. It is
bit-wise programmable for input or output via direction bits. For a pin con-
figured as input, the output driver is put into high-impedance state. Port 1
is used as the 16-bit address bus (A) in demultiplexed bus modes and
also after switching from a demultiplexed bus mode to a multiplexed bus
mode.
The following PORT1 pins also serve for alternate functions:
I P1H.4 CC24IO CAPCOM2: CC24 Capture Input
I P1H.5 CC25IO CAPCOM2: CC25 Capture Input
I P1H.6 CC26IO CAPCOM2: CC26 Capture Input
I P1H.7 CC27IO CAPCOM2: CC27 Capture Input
I Input to the oscillator amplifier and input to the internal clock generator
O Output of the oscillator amplifier circuit.
To clock the device from an external source, drive XTAL1, while leaving
XTAL2 unconnected. Minimum and maximum high/low and rise/fall times
specified in the AC Characteristics must be observed.
I Reset Input with Schmitt-Trigger characteristics. A low level at this pin for
a specified duration while the oscillator is running resets the ST10C167.
An internal pullup resistor permits power-on reset using only a capacitor
connected to V_SS.
In bidirectional reset mode (enabled by setting bit BDRSTEN in SYSCON
register), the RSTIN line is pulled low for the duration of the internal reset
sequence.
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