Z87233 Datasheet, PDF (40/71 Pages) Zilog, Inc. – CMOS Z8-R MCU Consumer Controller Processor

Z87233
CMOS Z8“ MCU Consumer Controller Processor
34
Bit
Position
D7–D0
Bit
Field
T1
Reset
R/W State Description
R
X T1 Current Value
W
X T1 Automatic Reload Value
Range = 1–256 decimal; 01h–00h
Prescaler 1 Register
The Prescaler 1 Register, PRE1, controls clocking functions. READ/WRITE and
reset states for bits D7–D0 are listed in Table 18.
Table 18. Prescaler 1 Register—PRE1 F3h/R243 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
0
0
Note: W = Write, X = Indeterminate.
Bit
Position
D7–D2
Bit
Field
Prescaler
D1
Clock
D0
Count
Reset
R/W State Description
W
X Prescaler Modulo
Range = 1–64 decimal; 01h–00h
W
0 Clock Source
0: T1 External Timing Input (T_IN) Mode
1: T1 Internal
W
0 Count Mode
0: T1 Single Pass
1: T1 Modulo N
Counter/Timer 0 Register
The Counter/Timer 0 Register, T0, controls timing and counter functions. READ/
WRITE and reset states for bits D7–D0 are listed in Table 19.
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
PS022701-0104