EM78P803A
EM78P803A is 8-bit MCU manufactured by ELAN Microelectronics.
description note, it includes important messages.)
1. There are some undefined or not existent bits in the registers. For these bits, user need to take more care on them while program use them as data to execute logic or math operations. Because these bits are not relative to chip function, they never test in the factory. We use different symbols to recognize them.
“0” or “1” Î value always equal to 0 or value always equal to 1, (not existent, read only) “-“ Î value unknown, (not existent) undefined bits do not allow to use. “x” Î (general purpose) undefined bits do not allow to use as RAM or other data read, write or read/write.
2. You will see some names for the register bits definitions. Some name will appear very frequently in the whole spec. The following describes the meaning for the register’s definitions such as bit type, bit name, bit number and so on.
PAGE0
7 RAB7 R /W -0
6 RAB6 R/W -0
5 BAB5
R-1
4 RAB4 R /W -1
- 2 RAB2
1 RAB1
R-0
0 RAB0 R/W
Bit type read/write (default value=0) read/write (default value=1) read only (w/o default value) read/write (w/o default value)
Bit name
Bit number Register name and its page read only (default value=1)
(undefined) not allowed to use read only (default value=0)
3. Family Relation
Mask EM78805C
ROMless EM78R803
OTP EM78P803A
4. Main Function Difference
Type ROM size Max. I/O
EM78805C Mask
12k x 13b 22
Main Clock
3.5826MHz x 1/8, 1/2, 1, 2
LCD (Max. Seg.x .)
Tone Generator
DED R to F Counter
24 x 8/4 1/4 Bias
Yes
Yes No
16-bit counter
No
EM78P803A...
