Z86E3016ESE ZILOG [Zilog, Inc.], Z86E3016ESE Datasheet - Page 45
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Z86E3016ESE
Manufacturer Part Number
Z86E3016ESE
Description
Z8 4K OTP Microcontroller
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z86E3016ESE.pdf
(66 pages)
- Current page: 45 of 66
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SCLK/TCLK Divide-by-16 Select (D0). This bit of the
SMR controls a divide-by-16 prescaler of SCLK/TCLK.
The purpose of this control is to selectively reduce device
power consumption during normal processor execution
(SCLK control) and/or HALT mode (where TCLK sources
counter/timers and interrupt logic).
External Clock Divide-by-Two (D1). This bit can elimi-
nate the oscillator divide-by-two circuitry. When this bit is
0, the System Clock (SCLK) and Timer Clock (TCLK) are
equal to the external clock frequency divided by two. The
SCLK/TCLK is equal to the external clock frequency when
this bit is set (D1=1). Using this bit together with D7 of
DS97Z8X0500
SMR D4 D3 D2
Stop-Mode Recovery Edge
Select (SMR)
P33 From Pads
Digital/Analog Mode
Select (P3M)
0
VDD
0
P30
P31
P32
0
SMR
D4 D3 D2
0
0
0
0
1
1
P33
1
0
1
SMR
D4 D3 D2
1
0
Figure 32. STOP-Mode Recovery Source
P27
0
SMR2 D1 D0
SMR
0
P R E L I M I N A R Y
VDD
D4 D3 D2
1
0
0
P20
P23
1
P20
P23
PCON further helps lower EMI (i.e., D7 (PCON) = 0, D1
(SMR) = 1). The default setting is zero.
STOP-Mode Recovery Source (D2, D3, and D4). These
three bits of the SMR register specify the wake up source
of the STOP-Mode Recovery (Figure 32). Table 12 shows
the SMR source selected with the setting of D2 to D4. P33-
P31 cannot be used to wake up from STOP mode when
programmed as analog inputs. When the STOP-Mode Re-
covery sources are selected in this register then SMR2
register bits D0, D1 must be set to zero.
Note: If the Port2 pin is configured as an output, this output
level will be read by the SMR circuitry..
SMR
SMR2
D4 D3 D2
1
D1 D0
0
1
P20
P27
1
0
P20
P27
Z8 4K OTP Microcontroller
SMR
MUX
SMR2
D4 D3 D2
1
1
D1 D0
1
1
T o P33 Data
Latch and IRQ1
Z86E30/E31/E40
0
T o POR
RESET
45
1
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