[Coco] Re: 6X09 -> HC11/HC12

[jdaggett at gate.net]

Tim

The HC11 source is similar to the 6809. One major drawback on the HC11 is there 
is no idirect index mode, and index mode is for the X and Y registers only, and 
there is no auto increment/decrement of the pointer registers. 

The HC12 and its corresponding CPU12, does allow indirect indexed mode of all 
thepointer registers includeing the SP and PCR, and autoincrement/autodecrement 
of the X, Y or SP registers. The auto increment and decrement can be between 1 
and 8. 

Despite the lack of the U regisiter the HC12 is a more likely candidate for the 6809. 
The 6309 is more a candidate for the HC16. In the HC16 you have:

A — Accumulator A  (8bits)
B — Accumulator B (8bits)
D — Accumulator D (16 bits) A and B like the 6809
E — Accumulator E (16bits)
IX — Index register X (16 bits)
IY — Index register Y (16 bits)
IZ — Index register Z (16 bits)
SP — Stack pointer (16 bits)
PC — Program counter (16 bits)
K — Address extension register (16 bits) accessed as four nibbles
    EK — Extended addressing extension field
    XK — Index register X extension field
    YK — Index register Y extension field
    ZK — Index register Z extension field
PK — Program counter extension field (part of the 16 bit CCR)
SK — Stack pointer extension register

Multiply and Accumalte registers (MAC)

SL — Multiply and accumulate sign latch (1bit)
XMSK — Modulo addressing index register X mask (16 bits)
YMSK — Modulo addressing index register Y mask (16 bits)
AM — Accumulator M (36 bits in two sections; bits 0 :15 and 16:35))
CCR — Condition code register (16 bits; 12 bits CCR and four bits are the PK field)
IR — Multiply and accumulate multiplicand register (16 bit)
HR — Multiply and accumulate multiplier register (16 bit)

The HC16 programming model is and commands are a blend of the HC11 and the 
68K. Also some of the adressing modes similar to the 6809.

Caution of the HC16. It is not one of the Motorola polular microcontrollers and the 
two or three flavors that would be useful here are now in end of life mode. The :

HC16Z1 Romless and General Purpose Timer Unit(GPT)
HC916X1 Same as HC16Z1 with 48K of Flash mapable on 64K boundaries
HC916Y1 48K internal flash mapable on any 64K boundary and TPU in stead of 
GPT
HC916Y3 Similar to the Y1 but with 96K of flash. 

All the flash versions are now obsolete. The masked rom version will most likely be 
next. 

james

On 16 Jan 2004 at 0:17, Tim S wrote:

To:             	coco at maltedmedia.com
From:           	"Tim S" <stahta01 at juno.com>
Date sent:      	Fri, 16 Jan 2004 00:17:50 -0500
Subject:        	[Coco] Re: 6X09 -> HC11/HC12
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> It should be sorta easy to convert ASM code from HC11 to work on 6809,
> but the HC11 has less registers than 6809 so it will be a little
> harder going the other way. If you wish to convert 6809 to HC1x I
> would choose the HC12 or HC16.  My info comes from only reading the
> Programming manuels on the three CPUs. ( Note: from a pin-out point of
> view the HC16 looks a lot like the 68000)
> 
> None of the four CPUs are Binary code compatible.
> The HC11 is mostly ASM compatible with the 6800, it was designed to be
> easy to re-assemble 6800 code with very minor changes on the HC11.
> 
> Tim S
> 
> 
> 
> 
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