User Manual

ATAR862-3

4556B–4BMCU–02/03

Figure 92. FSK Modulation

Microcontroller Block The microcontroller block is a multichip device which offers a combination of a MARC4-

based microcontroller and a serial E2PROM data memory in a single package. A micro-

controller is used and as serial E2PROM the U505M. Two internal lines can be used as

chip-to-chip link in a single package. The maximum internal data communication fre-

quency between the microcontroller block and the U505M over the chip link (MCL_SC

and MCL_SD) is f

SC_MCL

= 500 kHz.

The microcontroller and the EEPROM portions of this multi-chip device are equivalent to

their respective individual component chips, except for the electrical specification.

Internal 2-wire Multi-chip Link Two additional on-chip pads (MCL_SC and MCL_SD) for the SC and the SD line can be

used as chip-to-chip link for multi-chip applications. These pads can be activated by set-

ting the MCL-bit in the SISC-register.

Figure 93. Link between the Microcontroller Block and U505M

U505M EEPROM The U505M is a 512-bit EEPROM internally organized as 32 x 16-bits. The program-

ming voltage as well as the write-cycle timing is generated on-chip. The U505M features

a serial interface allowing operation on a simple two-wire bus with an MCL protocol. Its

low power consumption makes it well suited for battery applications.

01234012340123

Counter 3

CM31

CM32

40120120120120120120120123

T3R

T3O

01 0

SCL SDA

MCL_SC MCL_SD

U505M

Microcontroller

BP40/SC

BP10

BP43/SD

BP13

Multi chip link