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| 型號(hào)： | HMS99C58S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
| 中文描述： | 8位單片機(jī)與嵌入式閃存微控制器 |
| 文件頁(yè)數(shù)： | 13/73頁(yè) |
| 文件大?。?/td> | 696K |
| 代理商： | HMS99C58S |
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HMS99C51S/52S/54S/56S/58S
Sep. 2004 Ver 1.01
9
XTAL1
21
19
15
I
XTAL1
Input to the inverting oscillator amplifier and input to
the internal clock generator circuits. To drive the
device from an external clock source, XTAL1 should
be driven, while XTAL2 is left unconnected. There are
no requirements on the duty cycle of the external
clock signal, since the input to the internal clocking
circuitry is divided down by a divide-by-two flip-flop.
Minimum and maximum high and low times as well as
rise and fall times specified in the AC characteristics
must be observed.
P2.0-P2.7
24-31
21-28
18-25
I/O
Port 2
Port 2 is an 8-bit bidirectional I/O port with internal
pull-ups. Port 2 pins that have 1s written to them are
pulled high by the internal pull-up resistors and can be
used as inputs. As inputs, port 2 pins that are
externally pulled low will source current because of
the pulls-ups (I
IL
, in the DC characteristics). Port 2
emits the high-order address byte during fetches from
external program memory and during accesses to
external data memory that use 16-bit addresses
(MOVX @DPTR). In this application it uses strong
internal pull-ups when outputting 1s. During accesses
to external data memory that use 8-bit addresses
(MOVX @Ri), port 2 emits the contents of the P2
special function register.
Some Port 2 pins receive the high-order address bits
during flash program, verify, and erase operations.
PSEN
32
29
26
O
The Program Store Enable
The read strobe to external program memory when
the device is executing code from the external
program memory. PSEN is activated twice each
machine cycle, except that two PSEN activations are
skipped during each access to external data memory.
PSEN is not activated during fetches from internal
program memory.
RESET
10
9
4
I
RESET
A high level on this pin for two machine cycles while
the oscillator is running resets the device. The port
pins will be driven to their reset condition when a
minimum V
IH
voltage is applied whether the oscillator
is running or not. An internal diffused resistor to V
SS
permits power-on reset using only an external
capacitor to V
CC
.
Symbol
Pin Number
Input/
Output
Function
PLCC-
44
PDIP-
40
MQFP-
44
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