Z51F3220FNX Datasheet, PDF (149/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
11.8.5 16-Bit Timer 3 Capture Mode
The 16-bit Capture mode is selected by control register as shown in Figure 11.33.
The 16-bit capture mode is the same operation as 8-bit capture mode, except that the timer register uses 16 bits.
The 16-bit timer 3 capture mode is set by T3MS, T4MS as ‘1’. The clock source is selected from T3CK[2:0] and
16BIT bit must be set to ‘1’. Timer 3 is LSB 8-bit, the timer 4 is MSB 8-bit.
T3 CR
T4 CR
T3EN
–
T3MS T3CK2 T3CK1 T3CK0 T3CN T3 ST
1
–
1
X
X
X
X
X
16BIT
1
T4MS
1
T4CN
X
T4ST
X
T4CK3 T4CK2 T4CK1 T4 CK0
1
1
1
1
ADDRESS:1000 H (ESFR)
INITIAL VALUE : 0000 _0000B
ADDRESS:1002 H (ESFR)
INITIAL VALUE : 0000 _0000B
EC3
P
fx/2
T3ST
r
fx/4
16-bit Timer 3 Counter
e
fx/8
s
M
U
T4CNT/T3CNT (16Bit)
Clear
fx
c ^fx/32
X
MSB
LSB
a fx/128
Clear
l _fx/512
e
T3CN
Match
r ^fx/2048
Comparator
3
T3CK[2:0]
EIPOL 0L[1:0 ]
T4DR/T3DR (16Bit)
MSB
LSB
16-bit Timer 3 Data Register
2
EINT0
T4CAPR/T3CAPR (16 Bit)
MSB
LSB
16-bit Timer 3 Capture Register
T3MS
INT_ACK
Clear
T3IFR
To interrupt
block
T3 O
S/W
Clear
FLAG 0
(EIFLAG0.0)
To interrupt
block
NOTE) The T4CR.7 bit (16BIT) should be set to ‘1’ and the T4CK[3:0] should be set to “1111b”.
Figure 11.33 16-Bit Capture Mode for Timer 3
PS029902-0212
PRELIMINARY
146