SAF-C167CR-16RM View Datasheet(PDF) - Siemens AG

Part Name

Description

Manufacturer

SAF-C167CR-16RM

16-Bit CMOS Single-Chip Microcontrollers

Siemens AG 

C167CR-16RM 20Dec96@09:25h Intermediate Version

Pin Definitions and Functions (cont’d)

Symbol Pin

Input (I) Function

Number Output (O)

PORT1:

I/O

P1L.0 – 118 –

P1L.7, 125

P1H.0 - 128 –

P1H.7 135

132

I

133

I

134

I

135

I

PORT1 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 configured as input, the output driver

is put into high-impedance state. PORT1 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:

P1H.4 CC24IO CAPCOM2: CC24 Capture Input

P1H.5 CC25IO CAPCOM2: CC25 Capture Input

P1H.6 CC26IO CAPCOM2: CC26 Capture Input

P1H.7 CC27IO CAPCOM2: CC27 Capture Input

XTAL1 138

I

XTAL2 137

O

XTAL1: Input to the oscillator amplifier and input to the

internal clock generator

XTAL2: 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.

RSTIN 140

I

RSTOUT 141

O

Reset Input with Schmitt-Trigger characteristics. A low level at

this pin for a specified duration while the oscillator is running

resets the C167CR-16RM. An internal pullup resistor permits

power-on reset using only a capacitor connected to VSS.

Internal Reset Indication Output. This pin is set 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.

NMI

142

I

Non-Maskable Interrupt Input. A high to low transition at this

pin causes the CPU to vector to the NMI trap routine. When

the PWRDN (power down) instruction is executed, the NMI

pin must be low in order to force the C167CR-16RM to go into

power down mode. If NMI is high, when PWRDN is executed,

the part will continue to run in normal mode.

If not used, pin NMI should be pulled high externally.

VAREF

37

-

VAGND

38

-

VPP

84

-

Reference voltage for the A/D converter.

Reference ground for the A/D converter.

Flash programming voltage. This pin accepts the

programming voltage for flash versions of the C167CR-16RM.

Note: This pin is not connected (NC) on non-flash versions.

Semiconductor Group

8

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