Z86E4000ZDV Zilog, Z86E4000ZDV Datasheet - Page 43

• Manufacturer Part Number: Z86E4000ZDV
• Description: 44 PIN PLCC ADAPTER
• Manufacturer: Zilog

Specifications of Z86E4000ZDV

• Convert From (adapter End): 40-Pin DIP ZIF Socket
• Convert To (adapter End): 44-PLCC Plug
• For Use With/related Products: Zilog Emulators/Programmers
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-2015

Zilog
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
DS97Z8X0502
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 Recovery 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
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