W78IRD2 Datasheet, PDF (27/76 Pages) Winbond – 8-BIT MICROCONTROLLER

W78IRD2
Continued
BIT NAME
FUNCTION
2
- Reserved
1
- Reserved
Stretch MOVX select bits: This bit is used to select the stretch value for the MOVX
instruction, which enables the microcontroller to access slower memory devices or
0
MD peripherals transparently and without the need for external circuits. The RD or WR
strobe and all internal timings are stretched by the selected interval. The default
value is 1 cycle. For faster access, set the value to 0.
CKCON has an unrestricted read access, however, the write access is protected by timed-access
protection. See the section of timed-access protection for more information.
Accumulator
Bit:
7
ACC.7
6
ACC.6
5
ACC.5
4
ACC.4
3
ACC.3
2
ACC.2
1
ACC.1
0
ACC.0
Mnemonic: ACC
Address: E0h
ACC.7-0: The A (or ACC) register is the standard 8052 accumulator.
Port 4
Bit:
7
6
5
4
3
2
1
0
-
-
-
- P4.3/INT2 P4.2/INT3 P4.1
P4.0
Mnemonic: ACC
Address: E8h
P4.3-0: Port 4 is a bi-directional I/O port with internal pull-ups.
BIT
7–4
3
2
1
0
NAME
FUNCTION
- Reserved
P4.3 _{Port 4 Data bit which outputs to pin P4.3 in mode 0, or external interrupt INT2 .}
P4.2 Port 4 Data bit which outputs to pin P4.2 in mode 0, or external interrupt _INT3 .
P4.1 Port 4 Data bit which outputs to pin P4.1 in mode 0.
P4.0 Port 4 Data bit which outputs to pin P4.0 in mode 0.
PCA Counter Low Register
Bit:
7
6
CL.7 CL.6
5
CL.6
4
CL.4
3
CL.3
2
CL.2
1
CL.1
0
CL.0
Mnemonic: CL
Address: E9h
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Publication Release Date: October 2, 2006
Revision A7