11
8Bit Single Chip Microcontroller
DMC73C168
NAME
NC
PIN NO. I/O
78
FUNCTION DESCRIPTION
PORT TYPE
No connection
RESET
80
I
System reset request input port.
The reset pin must be held low for minimum of 5 internal
clock cycles to guarantee recognition by the device.
The device initialization requires 15 machine cycles.
CE/INT1
79
I
Device selection Signal input port.
External interrupt input port.
Schimitt-
Trigger-IN
This port can be used as a Chip Enable input.
When activated, CPU resumes its operation from HALT
mode
4. ARCHITECTURE
The DMC73C168 has a maximum memory address space of 64K bytes and only the Single-Chip mode.
On-Chip memory spaces are configured as shown in Table 4.1.
In the sections that follow, the Register File (RF) and the Peripheral File (PF) are described along
with three important registers in the CPU : the Stack Pointer (SP), the Status Register (ST), and the
Program Counter (PC)
Memory Address
> 0000
Register File (RF)
; 256 byte RAM
> 00FF
> 0100
Peripheral File (PF)
> 0132
> 013F
> 0133
> 0140
> 01C0
> C006
Reserved
128 byte PRF
Not Available
; 128 byte RAM
> 01BF
> C005
16K bytes ROM
> FFFF
Table 4-1. DMC73C168 Memory Map
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