em78p156n ELAN Microelectronics Corp, em78p156n Datasheet - Page 11

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

This specification is subject to change without prior notice.
4. R3 (Status Register)
5. R4 (RAM Select Register)
6. R5 ~ R6 (Port 5 ~ Port 6)
7. RF (Interrupt Status Register)
as R0.
software.
• Bit 0 (C) Carry flag
• Bit 1 (DC) Auxiliary carry flag
• Bit 2 (Z) Zero flag.
• Bit 3 (P) Power down bit.
• Bit 4 (T) Time-out bit.
time-out.
• Bit5 ~7 (GP0 ~ 2) General-purpose read/write bits.
• Bits 0~5 are used to select registers (address: 00~06, 0F~3F) in the indirect addressing mode.
• Bits 6~7 are not used (read only).
• The Bits 6~7 set to “1” at all time.
• Z flag of R3 will set to “1” when R4 content is equal to “3F.” When R4=R4+1, R4 content will select
• See the configuration of the data memory in Fig. 4.
• R5 and R6 are I/O registers.
• Only the lower 4 bits of R5 are available.
“1” means interrupt request, and “0” means no interrupt occurs.
• Bit 0 (TCIF) TCC overflow interrupt flag. Set when TCC overflows, reset by software.
• Bit 1 (ICIF) Port 6 input status change interrupt flag. Set when Port 6 input changes, reset by
• Bit 2 (EXIF) External interrupt flag. Set by falling edge on /INT pin, reset by software.
• Bits 3 ~ 7 Not used.
GP2
Set to "1" if the result of an arithmetic or logic operation is zero.
Set to 1 during power on or by a "WDTC" command and reset to 0 by a "SLEP" command.
Set to 1 with the "SLEP" and "WDTC" commands, or during power up and reset to 0 by WDT
7
7
-
GP1
6
6
-
GP0
5
5
-
11
4
T
4
-
3
P
3
-
EXIF
2
Z
2
ICIF
DC
1
1
EM78P156N
OTP ROM
07.29.2004 (V1.2)
TCIF
C
0
0