Z87C33 Datasheet, PDF (41/72 Pages) Zilog, Inc. – CMOS Z8® MCU Consumer Controller Processor

Z87C33
CMOS Z8“ MCU Consumer Controller Processor
35
Table 19. Counter/Timer 0 Register—T0 F4h/R244 Bank 0h: READ/WRITE
Bit
D7 D6 D5
R/W
R/W R/W R/W
Reset State
X
X
X
Note: R = Read, W = Write, X = Indeterminate.
D4
R/W
X
D3
R/W
X
D2
D1
D0
R/W R/W R/W
X
X
X
Bit
Position
D7–D0
Bit
Field
T0
Reset
R/W State Description
R
X T0 Current Value
W
X T0 automatic Reload Value
Range = 1–256 decimal; 01h - 00h
Prescaler 0 Register
The Prescaler 0 Register PRE0 controls clocking functions. WRITE and reset
states for bits D7–D0 are listed in Table 20.
Table 20. Prescaler 0 Register—PRE0 F5h/R245 Bank 0h: WRITE ONLY
Bit
D7
D6 D5
D4
D3
D2
D1
D0
R/W
W
W
W
W
W
W
W
W
Reset State
X
X
X
X
X
X
X
0
Note: W = Write, X = Indeterminate.
Bit
Position
D7–D2
Bit
Field
Prescaler
D1
Reserved
D0
Count
Reset
R/W State Description
W
X Prescaler Modulo
Range = 1–64 decimal; 01h–00h
W
X Reserved—must be 0
W
0 Count Mode
0: T0 Single Pass
1: T0 Modulo N
PS015601-1003