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Z86E72 Datasheet(PDF) 49 Page - Zilog, Inc.

No. de Pieza. Z86E72
Descripción  OTP IR MICROCONTROLLERS
Descarga  74 Pages
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Fabricante  ZILOG [Zilog, Inc.]
Página de inicio  http://www.zilog.com
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Z86E72 Datasheet(HTML) 49 Page - Zilog, Inc.

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Z86E72/E73
OTP IR Microcontrollers
DS96LVO1100
P R E L I M I N A R Y
1-49
1
HALT. HALT turns off the internal CPU clock, but not the
XTAL oscillation. The counter/timers and external inter-
rupts IRQ0, IRQ1, IRQ2, IRQ3, and IRQ4 remain active.
The devices are recovered by interrupts, either externally
or internally generated. An interrupt request must be exe-
cuted (enabled) to exit HALT mode. After the interrupt ser-
vice routine, the program continues from the instruction af-
ter the HALT.
STOP. This instruction turns off the internal clock and ex-
ternal crystal oscillation and reduces the standby current
to 10
µA (typical) or less. STOP mode is terminated only
by a reset, such as WDT time-out, POR, SMR, or external
reset. This causes the processor to restart the application
program at address 000CH. In order to enter STOP (or
HALT) mode, it is necessary to first flush the instruction
pipeline to avoid suspending execution in mid-instruction.
To do this, the user must execute a NOP (opcode = FFH)
immediately before the appropriate sleep instruction, i.e.,
FF
NOP
; clear the pipeline
6F
STOP
; enter STOP mode
or
FF
NOP
; clear the pipeline
7F
HALT
; enter HALT mode
Port Configuration Register (PCON). The PCON regis-
ter configures the comparator output on Port 3. It is locat-
ed in the expanded register file at Bank F, location 00 (Fig-
ure 44).
Comparator Output Port 3 (D0). Bit 0 controls the com-
parator used in Port 3. A 1 in this location brings the com-
parator outputs to P34 and P37, and a 0 releases the Port
to its standard I/O configuration.
Stop-Mode Recovery Register (SMR). This register se-
lects the clock divide value and determines the mode of
Stop-Mode Recovery (Figure 46). All bits are write only ex-
cept bit 7, which is read only. Bit 7 is a flag bit that is hard-
ware set on the condition of STOP recovery and reset by
a power-on cycle. Bit 6 controls whether a low level or a
high level is required from the recovery source. Bit 5 con-
trols the reset delay after recovery. Bits D2, D3, and D4, of
the SMR register, specify the source of the Stop-Mode Re-
covery signal. Bit D0 determines if SCLK/TCLK are divided
by 16 or not. The SMR is located in Bank F of the Expand-
ed Register Group at address 0BH
Figure 39. Port Configuration Register (PCON)
(Write Only)
Reserved (Must be 1)
D7
D6
D5
D4 D3
D2
D1
D0
PCON (0F) 0H
Comparator Output Port 3
0 P34, P37 Standard Output*
1 P34, P37 Comparator Output
* Default Setting After Reset


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