CALIFORNIA MICRO DEVICES
1987, 1996 CMD Corp. All rights reserved.
8/96
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846
G65SC816
CMOS 8/16-BIT MICROPROCESSOR FAMILY
Features
Advanced CMOS design for low power consumption
and increased noise immunity
Emulation mode for total software compatibility
with 6502 designs
Full 16-bit ALU, Accumulator, Stack Pointer,
and Index Registers
Direct register for zero page addressing
24 addressing modes (including 13 original
6502 modes)
Wait for Interrupt (WAI) and Stop the Clock (STP)
instructions for reduced power consumption and
decreased interrupt latency
91 instructions with 255 opcodes
Co-Processor (COP) instruction and associated vector
Powerful Block Move instructions
Product Description
The G65SC816 is an advanced CMOS 16-bit microprocessor featuring total software compatibility with 8-bit NMOS and
CMOS 6500 series microprocessors. The G65SC816 provides 24 address lines for 16 Mbyte addressing, while providing
both 8-bit and 16-bit operation.
This microprocessor contains an Emulation (E) mode for emulating 8-bit NMOS and CMOS 6500 Series microprocessors.
A software switch determines whether the processor is in the 8-bit emulation mode or in the native 16-bit mode. This
allows existing 8-bit system designs to use the many powerful features of the G65SC816.
Full 16-bit operation with 24 address lines for the
16 MByte memory
Program selectable 8-bit mode for 6502 coding
compatibility Valid Program Address (VPA) and Valid
Data Address (VDA) outputs for dual cache and DMA
cycle steal implementation
Vector Pull (VP) output indicates when interrupt
vectors are being fetched. May be used for
vectoring/prioritizing interrupts
Abort interrupt and associated vector for interrupting
any instruction without modifying internal registers
Memory Lock (ML) for multiprocessor system
implementation
40-pin DIP, 44-pin PLCC
Contact factory for complete data sheet.
A0 A15
CONROL
SIGNALS
SO
BE
RDY
2 (IN)
1 (OUT)
2 (OUT)
RES
NMI
I
ABOR
T
RQ
R/
SYNC
VPA
VDA
E
M/X
W
ML
VP
D0/BA0-D7/BA7
INDEX X & Y STACK
POINTER REGS (16)
ALU (16)
ACCUMULATOR
(16)
INTERRUPT
CONTROL
TIMING
AND
CLOCK GEN
SYSTEM
CONTROL
CPU
STATUS
REG
DA
T
A
BUS BANK
ADDRESS BUFFER
ADDRESS BUFFER
16-BIT
INTERNAL
D
A
T
A BUS
INSTRUCTION
DECODE
AND
CONTROL
PROGRAM
COUNTER (16)
DIRECT REG
(16)
PROGRAM DATA
BANK RAGS (8)
Block Diagram
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