RC220x

©2005 Radiocrafts AS

RC220x Data Sheet (rev. 1.0)

Page 8 of 17

JTAG Interface

The module offers a JTAG interface for Flash and EEPROM programming, as well as for

debugging.

Programming through the JTAG interface requires control of the four JTAG specific pins:

TCK, TMS, TDI, and TDO. Control of the reset and clock pins is not normally required. To be

able to use the JTAG interface, the JTAGEN Fuse must be programmed. The device is

default shipped with the fuse programmed. For further information, please refer to the

respective MCU data sheet.

The table below show the JTAG pin mapping.

Signal

RC2200

RC2202

RC2204

TDI

12

12

12

TDO

13

13

13

TMS

14

14

14

TCK

15

15

15

RESET

44

44

44

Supply and ground must also be connected during programming.

ISP Interface

The module offers an In-System Programming (ISP) interface for Flash and EEPROM

memory programming. The fastest way to do firmware downloading in manufacturing is

through the ISP interface rather then the JTAG interface.

The memory arrays can be programmed using the serial interface bus while RESET is pulled

to GND. The serial interface consists of pins SCK, PDI/MOSI (input) and PDO/MISO (output).

The RC2200 and RC2204 use the PDI and PDO pins (shared with UART0), while RC2202

use MOSI and MISO (shared with SPI interface), see table below.

After RESET is set low, the Programming Enable instruction needs to be executed first before

program/erase operations can be executed. More information is available in the respective

MCU data sheets.

The table below show the pin mapping for ISP programming.

Signal

RC2200

RC2202

RC2204

PDI

21

37

21

PDO

22

38

22

SCL

36

36

36

RESET

44

44

44

Supply and ground must also be connected during programming.