20-668-0003 Rabbit Semiconductor, 20-668-0003 Datasheet - Page 176

• Manufacturer Part Number: 20-668-0003
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0003

• Processor Type: Rabbit 2000 8-Bit
• Speed: 30MHz
• Voltage: 2.7V, 3V, 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 100-MQFP, 100-PQFP
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 30 MHz
• Operating Supply Voltage: 0 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 40
• Number Of Timers: 8 & 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 20-668-0003; 316-1062

17.2 Reading and Writing I/O Registers
The Rabbit has two I/O spaces: internal I/O registers and external I/O registers.
17.2.1 Using Assembly Language
The fastest way to read and write I/O registers in Dynamic C is to use a short segment of
assembly language inserted in the C program. Access is the same as for accessing data
memory except that the instruction is preceded by a prefix (
internal or external I/O space.For example.
In the example above the
I/O port. The prefix
17.2.2 Using Library Functions
Dynamic C functions are available to read and write I/O registers. These functions are pro-
vided for convenience. For speed, assembly code is recommended. For a complete
description of the functions noted in this section, refer to the Dynamic C User’s Manual
or from the
options.
To read internal I/O registers, there are two functions.
To write internal I/O registers, there are two functions.
The external registers are also accessible with Dynamic C functions.
In order to read a port the following code could be used:
170
// compute value and write to Port A Data Register
value=x+y
#asm
ld a,(value)
ioi ld (PADR),a
#endasm
int RdPortI(int PORT)
int BitRdPortI(int PORT, int bitcode); // bit code 0-7
void WrPortI(int PORT, char *PORTShadow, int value);
void BitWrPortI(int PORT, char *PORTShadow, int value, int bitcode);
int RdPortE(int PORT)
int BitRdPortE(int PORT, int bitcode); // bit code 0-7
int WrPortE(int PORT, char *PORTShadow, int value);
int BitWrPortE(int PORT, char *PORTShadow, int value, int bitcode);
k=RdPortI(PADR); // returns Port A Data Register
Help
menu in Dynamic C, access the
ioe
is used for writes to external I/O ports.
; value to write
; write value to PADR
ioi
prefix changes a store to memory to a store to an internal
; // returns PORT, high byte zero
; // returns PORT, high byte zero
HTML Function Reference
Rabbit 2000 Microprocessor User’s Manual
ioi
or
ioe
) to indicate the
or
Function Lookup