EM78156EAS EMC [ELAN Microelectronics Corp], EM78156EAS Datasheet - Page 12

• Manufacturer Part Number: EM78156EAS
• Description: 8-Bit Microcontroller with MASK ROM
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78156E
8-Bit Microcontroller with MASK ROM
8 •
4.2 Special Purpose Registers
4.2.1 A (Accumulator)
4.2.2 CONT (Control Register)
Bit 0 (PSR0) ~ Bit 2 (PSR2) TCC/WDT prescaler bits.
Bit 3 (PAB) Prescaler assignment bit.
Bit 4 (TE) TCC signal edge
Bit 5 (TS) TCC signal source
Bit 6 (/INT) Interrupt enable flag
Bit 7
CONT register is both readable and writable.
4.2.3 IOC5 ~ IOC6 (I/O Port Control Register)
"1" put the relative I/O pin into high impedance, while "0" defines the relative I/O pin as
output.
PSR2
Internal data transfer, or instruction operand holding
It cannot be addressed.
0
0
0
0
1
1
1
1
7
-
Not used.
0: TCC
1: WDT
0: increment if the transition from low to high takes place on TCC pin
1: increment if the transition from high to low takes place on TCC pin
0: internal instruction cycle clock
1: transition on TCC pin
0: masked by DISI or hardware interrupt
1: enabled by ENI/RETI instructions
PSR1
/INT
0
0
1
1
0
0
1
1
6
PSR0
0
1
0
1
0
1
0
1
TS
5
TE
(This specification is subject to change without further notice)
4
TCC Rate
1:128
1:256
1:16
1:32
1:64
1:2
1:4
1:8
PAB
3
Product Specification (V1.3) 07.29.2004
PSR2
2
WDT Rate
PSR1
1
1:128
1:16
1:32
1:64
1:1
1:2
1:4
1:8
PSR0
0