Controller Section; Figure 4. Vocon Board - Controller Section - Motorola ASTRO Digital Saber Service Manual

Controller Section

U201
32Kx8
EEPROM
U202
32Kx8
SRAM
U205
256Kx8
FLASH
U210
256Kx8
FLASH
HC11/DSP
Interface
7 2
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Refer to Figure 4 and your specific schematic diagram.
The controller section of the VOCON board consists entirely of digital
logic comprised of a microcontrol unit (MCU-U204), a custom support
logic IC (SLIC-U206), and memory consisting of: SRAM (U202),
EEPROM (U201), and FLASH memory (U205, U210).
The MCU (U204) memory system is comprised of a 32k x 8 SRAM
(U202), 32k x 8 EEPROM (U201), and 512k x 8 FLASH ROM
(U205,U210). The MCU also contains 1024 bytes of internal SRAM and
512 bytes of internal EEPROM. The EEPROM memory is used to store
customer specific information and radio personality features. The
FLASH ROM contains the programs which the HC11F1 executes. The
FLASH ROM allows the controller firmware to be reprogrammed for
future software upgrades or feature enhancements. The SRAM is used
for scratchpad memory during program execution.
The SLIC (U206) performs many functions as a companion IC for the
MCU. Among these are expanded input/output (I/O), memory
decoding and management, and interrupt control. It also contains the
universal asynchronous receiver transmitter (UART) used for the
RS232 data communications. The SLIC control registers are mapped
into the MCU (U204) memory space.
1024 Bytes
SRAM
Address/Data/
Control
U204
MC68HC11F1
Resets
U206
SLIC IV
Address/Data/
Control
Chip Selects/
Bank Control
Figure 4 . VOCON Board - Controller Section
SCI
512 Bytes
EEPROM
SPI
General
Purpose I/O
Clocks A/D
Clocks
Controls
General
Purpose I/O
RS232
Universal Connector
Transceiver/Display
ADSIC
Universal Connector
MAEPF-24337-O