Rainbow Electronics ATAR862-8 - Manual (Page 89)

89
ATAR862-8
4589B–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.
0 1 2 3 4 0 1 2 3 4 0 1 2 3
Counter 3
CM31
CM32
SO
4 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 3
T3R
4 0
T3O
1
0 1 0
SCL SDA
MCL_SC MCL_SD
U505M
Microcontroller
V
DD
BP40/SC
BP10
BP43/SD
BP13
Multi chip link
V
SS