參數(shù)資料
型號(hào)： L8708H
廠商： ZiLOG, Inc.
英文描述： IR/Low-Voltage Microcontroller
中文描述： 紅外/低電壓微控制器
文件頁(yè)數(shù)： 50/66頁(yè)
文件大?。?/td> 599K
代理商： L8708H
Z86L88/81/86/87/89/73
IR/Low-Voltage Microcontroller
50
P R E L I M I N A R Y
DS96LV00800
SCLK/TCLK Divide-by-16 Select
(D0). D0 of the SMR
controls a Divide-by-16 prescaler of SCLK/TCLK. The pur-
pose of this control is to selectively reduce device power
consumption during normal processor execution (SCLK
control) and/or HALT mode (where TCLK sources interrupt
logic). After Stop-Mode Recovery, this bit is set to a 0.
Stop-Mode Recovery Source
(D2, D3, and D4). These
three bits of the SMR specify the wake up source of the
STOP recovery (Figure 41 and Table 7).
Note:
Any Port 2 bit defined as an output will drive the cor-
responding input to the default state to allow the remaining
inputs to control the AND/OR function. Refer to SMR2 reg-
ister for other recover sources.
Stop-Mode Recovery Delay Select
(D5). This bit, if low,
disables the 5 ms /RESET delay after Stop-Mode Recov-
ery. The default configuration of this bit is one. If the "fast"
wake up is selected, the Stop-Mode Recovery source
needs to be kept active for at least 5TpC.
Stop-Mode Recovery Edge Select
(D6). A 1 in this bit po-
sition indicates that a High level on any one of the recovery
sources wakes the Z86LXX from STOP mode. A 0 indi-
cates Low level recovery. The default is 0 on POR (Figure
36).
Cold or Warm Start
(D7). This bit is set by the device
upon entering STOP mode. It is a Read Only Flag bit. A 1
in D7 (warm) indicates that the device will awaken from a
SMR source or a WDT while in STOP mode. A 0 in this bit
(cold) indicates that the device will be reset by a POR,
WDT while not in STOP, or the device awakened from a
low voltage standby mode.
Stop-Mode Recovery Register 2
(SMR2). This register
determines the mode of Stop-Mode Recovery for SMR2
Figure 42).
If SMR2 is used in conjunction with SMR, either of the
specified events will cause a Stop-Mode Recovery.
Note:
Port pins configured as outputs are ignored as a
SMR or SMR2 recovery source. For example, if the NAND
or P23-P20 is selected as the recovery source and P20 is
configured as an output then the remaining SMR pins
(P23-P21) form the NAND equation.
Table 7. Stop-Mode Recovery Source
SMR:432
Operation
Description of Action
Description of Action
D4
0
D3
0
D2
0
POR and/or external reset
recovery
Reserved
P31 transition
P32 transition
P33 transition
P27 transition
Logical NOR of P20
through P23
Logical NOR of P20
through P27
0
0
0
1
1
1
0
1
1
0
0
1
1
0
1
0
1
0
1
1
1
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