Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 44

• Manufacturer Part Number: Z86D99
• Description: Low-Voltage Micro controllers with ADC
• Manufacturer: ZILOG [Zilog, Inc.]

PS003807-1002
The six most significant bits (D
value from 11 to 64 decimal. The prescaler register also contains control bits that
specify T
T
The counter/timer T
that holds the initial count value, and a read-only register that holds the current
count value (see Figure 18 on page 35). The initial value can range from 1 to 256
decimal (
Figure 21. Counter/Timer 1 Register
Counter/Timer Operation
Under software control, T
(
Figure 22. Timer Mode Register
F1h
1
D
7
is internal or external.
) bits D
D
6
1
01h
counting modes. These bits also indicate whether the clock source for
D
2
–D
,
5
02h
3
: a Load bit and an Enable Count bit. See Figure 22.
D
, ...,
4
P
1
( F2h ) consists of an 8-bit down-counter, a write-only register
D
D
R
00h
3
3
1
E
). Figure 21 illustrates the counter/timer register.
D
D
is started and stopped using the Timer Mode register
Counter/Timer 1 Register
2
2
L
Timer Mode Register
2
–D
(
(
D
D
I
F2h
F1h
1
1
7
M
R241 TMR
) of PRE
; Read/Write)
; Read/Write)
R242 T1
Z86D990/Z86D991 OTP and Z86L99X ROM
D
D
0
0
I
Low-Voltage Microcontrollers with ADC
N
1
A
hold the prescaler count modulo, a
Initial value when written
(range 1–256 decimal, 01h – 00h )
Current value when read
Reserved
0 = No function
1 = Load T
0 = Disable T
1 = Enable T
R
Y
1
1
1
count
count
37