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EM6635 Datasheet(PDF) 4 Page - EM Microelectronic - MARIN SA

Part No. EM6635
Description  Low Power Microcontroller with RC and 32kHz oscillators and 9 high drive outputs
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Maker  EMMICRO [EM Microelectronic - MARIN SA]
Homepage  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6635 Datasheet(HTML) 4 Page - EM Microelectronic - MARIN SA

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EM6635
03/03 REV. B
Copyright
 2002, EM Microelectronic-Marin SA
4
www.emmicroelectronic.com
2. Peripheral Memory Allocation
Address HEX
Peripheral Function
0 - 3F
Data RAM page 0, 1, 2, 3
40 - 46
HW Control, Configuration
47 – 4C
Input/output Ports
4D - 4F
Free
50 - 55
Input/output Ports
56 – 5E
Timer1, Timer2, BCD counter
5F
Free
60 – 6B
Event Counter, Freq. Generator
Interrupt Controller
6C
Supply voltage level detector
6D
RC-Oscillator
6E
6F
CPU Index Reg. Low
CPU Index Reg. Hi
70 - 74
Serial Interface
75, 76
EM Test
77
RAM Page Register
78
Reserved
79 – 7D
Free
7E
7F
EM Test
EM Test
Special Access Modes for HW-Control 1 and -2:
There are two HW-Control registers (HW-Ctl-1, HW-Ctl-2) with different access modes. Each of these two registers can be
accessed by two different addresses. The access by address H40 for HW-Ctl-1 (H42 for HW-Ctl-2) is the normal access
method as every other register in the EM6635: The corresponding data bus value is written into the register bit.
Using address H41 (HW-Ctl-1) or address H43 (HW-Ctl-2) allows a bitwise access to the register. The CPU has not to care
about the states of the register bits which must not be modified.
With a high level at bits 0 to 2, the corresponding bits in the register are selected, while a low level unselects the register
bits. The level of bit 3 defines the action on the selected bits: a high level will set and a low level will clear the selected
register bits. Read access is done in the normal way.
If bits 0, 1, 2 are not selected (at Low level), the register at bit 3 is set if bit 3 is high or reset if it is low.
This concerns SelTBCapHi at HW-Ctl-2, address H43.
2.1 RAM Address Modes
The EM6635 has 4 pages of 64x4bits RAM’s built-in. The page number is coded on 2 bits, there are 4 pages.
The page number is stored on RAM index register at address H77.
The RAM is directly addressable on addresses decimal (0 to 63), and it is paged adressable.
To write or read the RAM page1, 2, 3 the user has first to set the offset value in the RAM Index register.
RAM index
PageSel[1]
PageSel[0]
Page
0
0
0
0
1
1
1
0
2
1
1
3


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