
MSP430x11x
MIXED SIGNAL MICROCONTROLLERS
SLAS196D DECEMBER 1998 REVISED SEPTEMBER 2004
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
memory organization
Int. Vector
2 KB ROM
128B RAM
16b Per.
8b Per.
SFR
FFFFh
FFE0h
FFDFh
F800h
027Fh
0200h
01FFh
0100h
00FFh
0010h
000Fh
0000h
MSP430C111
Int. Vector
4 KB
EPROM
256B RAM
16b Per.
8b Per.
SFR
FFFFh
FFE0h
FFDFh
02FFh
0200h
01FFh
0100h
00FFh
0010h
000Fh
0000h
MSP430P112
PMS430E112
Int. Vector
4 KB ROM
256B RAM
16b Per.
8b Per.
SFR
FFFFh
FFE0h
FFDFh
F000h
02FFh
0200h
01FFh
0100h
00FFh
0010h
000Fh
0000h
MSP430C112
F000h
peripherals
Peripherals are connected to the CPU through data, address, and control busses and can be handled using
all instructions. For complete module descriptions, refer to the MSP430x1xx Family User’s Guide, literature
number SLAU049.
oscillator and system clock
The clock system is supported by the basic clock module that includes support for a 32768-Hz watch crystal
oscillator, an internal digitally-controlled oscillator (DCO) and a high frequency crystal oscillator. The basic clock
module is designed to meet the requirements of both low system cost and low-power consumption. The internal
DCO provides a fast turn-on clock source and stabilizes in less than 6
s. The basic clock module provides the
following clock signals:
D Auxiliary clock (ACLK), sourced from a 32768-Hz watch crystal or a high frequency crystal.
D Main clock (MCLK), the system clock used by the CPU.
D Sub-Main clock (SMCLK), the sub-system clock used by the peripheral modules.
digital I/O
There are two 8-bit I/O ports implemented—ports P1 and P2 (only six P2 I/O signals are available on external
pins):
D All individual I/O bits are independently programmable.
D Any combination of input, output, and interrupt conditions is possible.
D Edge-selectable interrupt input capability for all the eight bits of port P1 and six bits of port P2.
D Read/write access to port-control registers is supported by all instructions.
NOTE:
Six bits of Port P2, P2.0 to P2.5, are available on external pins but all control and data bits for Port
P2 are implemented.