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EM78P156E Datasheet(PDF) 6 Page - ELAN Microelectronics Corp

Part No. EM78P156E
Description  8-bit microprocessor with low-power and high-speed CMOS technology
Download  28 Pages
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Maker  EMC [ELAN Microelectronics Corp]
Homepage  http://www.emc.com.tw
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EM78P156E Datasheet(HTML) 6 Page - ELAN Microelectronics Corp

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* This specification is subject to be changed without notice. 8.11.1999
B3-6
EM78P156E
Internal data transfer, or instruction operand holding
It can not be addressed.
2.
CONT (Control Register)
7
6
543
21
0
-
/INT
TS
TE
PAB
PSR2
PSR1
PSR0
Bit 0 (PSR0)~Bit 2 (PSR2) TCC/WDT prescaler bits.
PSR2
PSR1
PSR0
TCC Rate
WDT Rate
0
0
0
1:2
1:1
0
0
1
1:4
1:2
0
1
0
1:8
1:4
0
1
1
1:16
1:8
1
0
0
1:32
1:16
1
0
1
1:64
1:32
1
1
0
1:128
1:64
1
1
1
1:256
1:128
Bit 3 (PAB) Prescaler assignment bit.
0: TCC
1: WDT
Bit 4 (TE) TCC signal edge
0: increment if the transition from high to low takes place on TCC pin
1: increment if the transition from high to low takes place on TCC pin
Bit 5 (TS) TCC signal source
0: internal instruction cycle clock
1: transition on TCC pin
Bit 6 (INT) Interrupt enable flag
0: masked by DISI or hardware interrupt
1: enabled by ENI/RETI instruction
CONT register is both readable and writable.
3.
IOC5 ~ IOC6 (I/O Port Control Register)
“1” puts the relative I/O pin into high impedance, while “0” defines the relative I/O pin as output.
Only the lower 4 bits of IOC5 are able to be defined.
IOC5 and IOC6 registers are both readable and writable.
4.
IOCA (Prescaler Counter Register)
IOCA register is readable.
The value of IOCA is equal to the contents of Prescaler counter.
Down counter.


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