Z87C33 Datasheet, PDF (28/72 Pages) Zilog, Inc. – CMOS Z8® MCU Consumer Controller Processor

Z87C33
CMOS Z8“ MCU Consumer Controller Processor
22
Table 7. Port Configuration Register—PCON 00h/R0 Bank Fh: WRITE ONLY
Bit
D7
D6 D5
D4
D3
D2
D1
D0
R/W
W
WW
W
W
W
W
W
Reset
1
1
1
1
1
1
1
0
Note: R = Read, W = Write, X = Indeterminate.
Bit
Position
D7
Bit
Field
Oscillator
D6
Port 3 I/O
D5
Port 2 I/O
D4
Reserved
D3
Port 0 I/O
D2
Port 0 I/O
D1
Reserved
D0
Port 3
Reset
R/W State Description
W
1
Low-EMI Oscillator
0: Low EMI
1: Standard
W
1
Port 3
0: Low EMI
1: Standard
W
1
Port 2
0: Low EMI
1: Standard
W
1
Reserved*
1: Must be "1"
W
1
Port 0*
0: Low EMI
1: Standard
W
1
Port 0
0: Open-Drain
1: Push-Pull Active
W
1
Reserved*
1: Must be "1"
W
0
Port 3 Comparator Output
0: P34, P37 Standard Output
1: P34, P37 Comparator Output
Comparator Output Port 3 (D0). Bit 0 controls the comparator use in Port 3. A 1 in
this location brings the comparator outputs to P34 and P37, and a 0 releases the
Port to its standard I/O configuration. The default value is 0.
Port 0 Open-Drain (D2). Port 0 is configured as an open-drain by resetting this bit
(D2 = 0) or configured as push-pull active by setting this bit (D2 = 1). The default
value is 1.
Low-EMI Port 0 (D3). Port 0 is configured as a low-EMI port by resetting this bit (D3
= 0) or configured as a Standard Port by setting this bit (D3 = 1). The default value
is 1.
PS015601-1003