Z86E3416PSC View Datasheet(PDF) - Zilog
Part Name
Description
MFG CO.
'Z86E3416PSC' PDF : 84 Pages View PDF
CMOS Z8® OTP Microcontrollers
Product Specification
62
Reset and initially enabled by executing the WDT instruction and refreshed on subsequent
executions of the WDT instruction. The WDT is driven either by an on-board RC oscilla-
tor or an external oscillator from XTAL1 pin. The POR clock source is selected with bit 4
of the WDT register.
Note: Execution of the WDT instruction affects the Z (Zero), S (Sign), and V
(Overflow) flags.
WDT Time-Out Period (D0 and D1). Bits 0 and 1 control a tap circuit that determines
the time-out periods that can be obtained (Table 23). The default value of DO and Dl are 1
and 0, respectively.
Table 23. Time-out Period of WDT
Time-out of the
Internal RC
Time-out of the
D1
DO
OSC
System Clock
0
0
5 ms
0
1
10 ms1
128 SCLK
256 SCLK1
1
0
20 ms
512 SCLK
1
1
80 ms
2048 SCLK
Note: The default setting is 10 ms.
WDT During HALT Mode (D2). This bit determines whether or not the WDT is active
during HALT Mode. A “1” indicates that the WDT is active during HALT. A “0” disables
the WDT in HALT Mode. The default value is “1 “. WDT During STOP Mode (D3). This
bit determines whether or not the WDT is active during STOP mode. A “1” indicates
active during STOP. A “0” disables the WDT during STOP Mode. This is applicable only
when the WDT clock source is the internal RC oscillator.
Clock Source For WDT (D4). This bit determines which oscillator source is used to
clock the internal POR and WDT counter chain. If the bit is a 1, the internal RC oscillator
is bypassed and the POR and WDT clock source is driven from the external pin, XTAL1,
and the WDT is stopped in STOP Mode. The default configuration of this bit is 0, which
selects the RC oscillator.
Permanent WDT. When this feature is enabled, the WDT is enabled after reset and will
operate in Run and HALT Mode. The control bits in the WDTMR do not affect the WDT
operation. If the clock source of the WDT is the internal RC oscillator, then the WDT will
run in STOP mode. If the clock source of the WDT is the XTAL1 pin, then the WDT will
not run in STOP mode.
PS022901-0508
Electrical Characteristics
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