em78p156n ELAN Microelectronics Corp, em78p156n Datasheet - Page 12

• Manufacturer Part Number: em78p156n
• Description: 8-bit Micro-controller
• Manufacturer: ELAN Microelectronics Corp

This specification is subject to change without prior notice.
4.2 Special Purpose Registers
8. R10 ~ R3F
1. A (Accumulator)
2. CONT (Control Register)
• RF can be cleared by instruction but cannot be set.
• IOCF is the interrupt mask register.
• Note that the result of reading RF is the "logic AND" of RF and IOCF.
• All of these are 8-bit general-purpose registers.
• Internal data transfer, or instruction operand holding
• It cannot be addressed.
• 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 Not used.
PSR2
7
-
0
0
0
0
1
1
1
1
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
0
0
1
1
0
0
1
1
/INT
6
PSR0
0
1
0
1
0
1
0
1
TS
5
TCC Rate
1:128
1:256
1:16
1:32
1:64
12
1:2
1:4
1:8
TE
4
PAB
3
WDT Rate
PSR2
1:128
1:16
1:32
1:64
1:1
1:2
1:4
1:8
2
PSR1
1
EM78P156N
OTP ROM
07.29.2004 (V1.2)
PSR0
0