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-----------------------------------------------------------------------HMCS404CL
o
15
16
63
64
4095
4096
16383
l
I
Vector Address
Zero-Page Subroutine
(64Words)
Program
Pattern
(4096Words)
• RAM MEMORY MAP
$0000
0_
JMPL Instruction.
_
1
(Jump to RESET Routine)
$OOOF
2_
JMPL Instruction
-
$0010
(Jump to INTo Routine)
3
\
4
JMPL Instruction
5-
(Jump to
i1iii1
Routine)
-
6
JMPL Instruction
$ 003F
$0040
7 - (Jump to TIMER-A Routine) -
8
JMPL Instruction
-
-
9
(Jump to TIMER-B Routine)
10
11
$OFFF
121-
JMPL Instruction.
_
$1000
13
(Jump to SERIAL Routine)
14
$3FFF
15
Fig. 1 ROM Memory Map
$0000
$0001
$0002
$0003
$0004
$0005
$0006
$0007
$0008
$0009
$OOOA
$OOOB
$OOOC
$0000
$OOOE
$ OOOF
MeU
includes 256 digits x 4 bits
RAM
as the data area and
stack area. In addition to these areas, interrupt control bits
and special registers are also mapped on the
RAM
memory
space. RAM memory map is illustrated in Fig. 2 and described
in the following paragraph.
o
31
32
RAM-mapped Registers
Memory Registers(MR)
$000
$01F
$020
\
0
1
Interrupt Control Bits
2
3
4
Port Mode Reg.
(PMR) :W
47
48
---------------- ----
$ 02F
$ 000
$001
$002
$003
$004
$ 005
$006
$
007
$008
$ 009
$OOA
$OOB
$OOC
223
224
959
960
1023
Data
(192Digits)
Not Used
Stack
(64Digits)
R
:Read Only
W
:Write Only
R/W: Read/Write
$030
5
Serial Mode Reg.
(SMR) IW
6
Serial Data Reg. Lower (SRL) !R/W
7
Serial Data Reg. Upper (SRU) :R/W
8
Timer Mode Reg. A
(TMA)! W
9
Timer Mode Reg. B
(TMB)
I
W
$ODF
10_
TIMER-B·
(TCBLlTLRL) : R/W
$OEO
11
(TCBU/TLRU): R/W
12
$ 3BF
Not Used
$
3CO
31
$ 01F
$3FF
*
Two registers are mapped on same address.
Timer Load Reg. Lower
10~~~--~~--~~_+~~~T~im-e-r~L~~!~~~~~~~~~.u~p-p-er--~-i$00A
11
(TLRU)
$ OOB
Fig. 2 RAM Memory Map
345
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